European Decorative Dishes and Vide-Poche
to
581
2,634
326
16
95
278
2,261
342
227
1,307
493
34
18
62
102
57
264
359
297
57
19
1,023
212
208
197
81
42
30
29
26
24
20
18
13
13
7
5
5
3
1,375
768
661
387
286
1,973
941
2,976
945
842
763
695
Height
to
Width
to
2,976
2,746
2,868
48
36
25
24
23
Place of Origin: European
Vintage Greek Key Lidded Dish
Located in W Allenhurst, NJ
Beautiful Greek Lidded Dish, KE Greece, Blue and Gold, Ancient Greek Statues, Greek Mythology, Greek Key, Decorative Dish, Hand Made, 24k Gold Trim
Signed:
KE
Category
20th Century Greco Roman European Decorative Dishes and Vide-Poche
Materials
Ceramic
Tommaso Barbi Mid-Century Modern Italian, two Ceramic Tidy or Ashtray, Italy
By Tommaso Barbi
Located in Saint-Ouen, FR
Tommaso Barbi Mid-Century Modern Italian, two ceramic tidy or ashtray, Italy, circa 1960.
Category
1970s Mid-Century Modern Vintage European Decorative Dishes and Vide-Poche
Materials
Brass
Blue and White Delft Charger Hand-Painted, Netherlands, 18th Century, Circa 1760
Located in Katonah, NY
The entire surface of this blue and white Dutch Delft charger is covered in deep beautiful cobalt blue coloring.
The center of the charger is filled with lovely hand-painted peonies...
Category
Mid-18th Century Rococo Antique European Decorative Dishes and Vide-Poche
Materials
Delft
Ove Fritz Rasmussen. Art Deco bronze dish with a motif of deers.
Located in Copenhagen, DK
Ove Fritz Rasmussen, Danish bronze caster.
Art Deco bronze dish.
Featuring a motif of leaping deer.
Approximately from the 1940s.
Marked.
In excellent condition with patina.
Partiall...
Category
1940s Art Deco Vintage European Decorative Dishes and Vide-Poche
Materials
Bronze
Early 19th Century Shell Desert Dish Porcelain Hand Painted, Staffordshire UK
By Staffordshire
Located in Lincoln, Lincolnshire
This is an early 19th century porcelain desert dish with a fluted shell shape, made by one of the Staffordshire, English potteries and dating from the George 111rd period, circa 1820.
This piece is unmarked to the base but we believe it is very well hand painted and could be by one of the high quality English makers such as Coalport or Davenport. Either way this piece is a beautifully hand decorated piece in a stunning Imari style pattern with carefully hand-gilded highlights.
Overall a beautifully painted early English porcelain...
Category
Early 19th Century George III Antique European Decorative Dishes and Vide-Poche
Materials
Porcelain
Italian Agate Onyx Marble Vide-Poche Catchall
Located in New York, NY
A beautiful Italian organic Modern agate onyx marble vide-poche catchall, circa mid to late 20th century, Italy, 1970s. A great piece for a desk, vanity, walk-in-closet, nightstand o...
Category
Late 20th Century Organic Modern European Decorative Dishes and Vide-Poche
Materials
Onyx, Agate
Murano Sommerso Aqua Green Art Glass Bowl, Ashtray or Vide-Poche
Located in Barcelona, ES
Beautiful and colorful Aquan green Murano glass bowl with flower shape. Italy, 1960s.
It has a gradient of shades of green to clear glass and organic shapes.
A highly decorative pi...
Category
Mid-20th Century Mid-Century Modern European Decorative Dishes and Vide-Poche
Materials
Glass, Sommerso, Murano Glass, Blown Glass, Art Glass
Ashtray or Vide-Poche in Rostrato Murano Blown Glass by Barovier, Italy 1940s
By Ercole Barovier
Located in Roma, IT
Gorgeous ashtray or vide-poche in mouth-blown "rostrato" Murano glass. This stunning piece was realized during the 1940s in Italy by Ercole Barovier for Barovier & Toso.
In amazing ...
Category
Mid-20th Century Mid-Century Modern European Decorative Dishes and Vide-Poche
Materials
Glass, Art Glass, Blown Glass, Murano Glass
Fratelli Toso Murano Millefiori Pink Opalescent Italian Art Glass Heart Bowl
By Fratelli Toso
Located in Kissimmee, FL
Beautiful vintage Murano hand blown pink and opalescent Italian art glass heart shaped bowl with wild flower murrines. The piece is documented to the Fratelli Toso, circa 1950s. The ...
Category
Mid-20th Century Mid-Century Modern European Decorative Dishes and Vide-Poche
Materials
Glass, Art Glass, Blown Glass, Murano Glass, Murrine, Opaline Glass
Grey Color Fine Ceramic Petal Shaped Hand Made Tray, Italy, Contemporary
Located in New York, NY
Contemporary Italian fine ceramic petal shaped tray.
Grey color glaze.
Category
21st Century and Contemporary European Decorative Dishes and Vide-Poche
Materials
Ceramic
Brass and Aluminium Tray by David Marshall (circa 1990s)
By David Marshall
Located in London, GB
A leaf-shaped aluminium and brass brutalist style tray by David Marshall (circa 1990s). The shiny aluminium forms the base structure and the brass features on the edges of the piece....
Category
1990s European Decorative Dishes and Vide-Poche
Materials
Aluminum, Brass
Large Antique Meissen Serving Dish in Hand-Painted Porcelain, with Floral Motifs
Located in Copenhagen, DK
Large antique Meissen serving dish in hand painted porcelain, with floral motifs, late 19th century.
In very good condition.
Measures: 55 x 26 cm.
Stamped.
Category
Late 19th Century Antique European Decorative Dishes and Vide-Poche
Materials
Porcelain
Vintage Murano Glass Bowl, Blue Amber, 1960s, Italy, Fratelli Toso Attributed
By Fratelli Toso
Located in Glasgow, GB
A refined vintage Murano glass bowl, attributed to Fratelli Toso, one of Italy’s most esteemed glassmakers, circa 1960s.
This hand-blown Italian art glass dish exemplifies the somm...
Category
1960s Mid-Century Modern Vintage European Decorative Dishes and Vide-Poche
Materials
Murano Glass
Pair Antique Spode Green Grapes Pattern Dishes England Circa 1820
By Spode
Located in Katonah, NY
This pair of Spode pearlware shell-shaped dishes features the exquisite "Grapes" pattern.
Rich purple grapes, ochre/brown branches, and gorgeous two-tone green leaves cover the entir...
Category
Early 19th Century Antique European Decorative Dishes and Vide-Poche
Materials
Pearlware
Dino Martens AVEM Multicolor Murrine Millefiori Blue Rim Art Glass Bowl
By Dino Martens, Arte Vetraria Muranese (AVEM)
Located in Barcelona, ES
Sculptural multi-color Tutti Frutti Murano art glass bowl /ashtray attributed to Dino Martens and Arte Vetraria Muranese. Italy, 1950s-1960s
Zanfirico and latticino techniques in pastel colors and vibrant colors, silver aventurine flecks inclussions and a sky blue rim...
Category
20th Century Mid-Century Modern European Decorative Dishes and Vide-Poche
Materials
Silver Leaf
Hand Blown Glass Dish by Ghiro Studio
By Ghirò Studio
Located in New York, NY
Colored glass. Carved, shaped and polished from a large "slag glass" rock. "Ghiro" etched onto underside.
Category
21st Century and Contemporary Modern European Decorative Dishes and Vide-Poche
Materials
Blown Glass
Decorative wood vide poche
Located in grand Lancy, CH
Decorative wood vide poche
Category
1940s Vintage European Decorative Dishes and Vide-Poche
Materials
Wood
French glazed ceramic vide-poche bowl
Located in London, GB
An elegant glazed ceramic vide poche with green and gold decoration.
Category
Late 20th Century Modern European Decorative Dishes and Vide-Poche
Materials
Porcelain
Midcentury Modern Minimalist Desk or Vanity Tray Organizer Vide-Poche
Located in New York, NY
A Mid-Century Modern period or Minimalist style desk or vanity teak wood tray organizer. Piece has three compartment and can work well on a desk or on a...
Category
Mid-20th Century Mid-Century Modern European Decorative Dishes and Vide-Poche
Materials
Teak, Wood
Thorkild Olsen Royal Copenhagen Terracotta Gilt Craquelure Vide Poche Tray #3391
By Thorkild Olsen
Located in Rothley, Leicestershire
Thorkild Olsen for Royal Copenhagen, terracotta and grey crackle glazed porcelain vide poche.
Edged with gilded banding - an elegant and useful little tray
Signed and numbered 3391....
Category
Mid-20th Century Art Deco European Decorative Dishes and Vide-Poche
Materials
Porcelain
19th Century Small Dish Hand Painted Enamel and Ormolu Bronze
Located in Casteren, Noord-Brabant
An elegant small footed dish.
Made of gilded bronze with an enameled, hand painted dish in the centre.
The dish is in good condition.
Dimensions: 17 x 9 cm and 9 cm tall.
Made in Fra...
Category
1890s Napoleon III Antique European Decorative Dishes and Vide-Poche
Materials
Bronze, Enamel
Scandinavian Patinated Bronze Charger with Lucifer, Satan, 1930s
Located in Esbjerg, DK
Unusual Cast bronze dish with green verdigris patina. It features scenes from the old testement with depictions of Lucifer - Satan cast in relief arou...
Category
1930s Art Deco Vintage European Decorative Dishes and Vide-Poche
Materials
Bronze
1960s rattan bowl in the style of Gabriella Crespi
Located in Bastia Umbra, IT
1960s rattan bowl in the style of Gabriella Crespi, Made in Italy.
Beautiful rattan bowl in the style of Gabriella Crespi, can be used on a coffee table, dining table, as a fruit b...
Category
1960s Mid-Century Modern Vintage European Decorative Dishes and Vide-Poche
Materials
Rattan
Midcentury 'Hedgehog' Bowl in Terracotta
By Bay Keramik
Located in Meer, VAN
Fun and elegant ‘Hedgehog’ plate or bowl in terracotta, (West) Germany, mid 20th century.
This is a wonderful and fun piece of terracotta pottery. Originally meant for growing cress...
Category
Mid-20th Century Mid-Century Modern European Decorative Dishes and Vide-Poche
Materials
Terracotta
English Wedgwood Jasperware Ashtray or Key Holder/Vide Poche
By Wedgwood
Located in Miami, FL
Beautiful English Wedgwood Jasperware ashtray or key holder/vide poche in “Wedgwood Blue” features a repeating motif of white, high relief acanthus ...
Category
19th Century Neoclassical Antique European Decorative Dishes and Vide-Poche
Materials
Ceramic
Ceramic Smoking Set, A. Traversi, 1970s, Italy
Located in West Palm Beach, FL
A ceramic smoking set of a lighter and ashtray from Italy in the 1970s. Signed A. Traversi. Ceramic is burgundy in color with applied gold glaze resembling an inlay. The lighter is i...
Category
1970s Mid-Century Modern Vintage European Decorative Dishes and Vide-Poche
Materials
Ceramic
Vide-Poche or Ashtray Ceramic and Brass by Tommaso Barbi, Italy, 1970s
By Tommaso Barbi
Located in Rome, IT
Amazing round ashtray or vide-poche in granite effect ceramic and brass by the Italian designer Tommaso Barbi.
Made in Italy in the 1970s.
Tommaso Barbi's original label is s...
Category
1970s Mid-Century Modern Vintage European Decorative Dishes and Vide-Poche
Materials
Metal, Brass
XL Birch Plywood Tray by Saarinen, Finland
By Tapio Wirkkala
Located in La Teste De Buch, FR
XL birch plywood tray or platter by Saarinen & Schauman Wisa
Made in Finland, second half of the 20th century
Marked accordingly.
Category
20th Century European Decorative Dishes and Vide-Poche
Materials
Birch, Plywood
Alfredo Barbini Murano Glass Shell – Carmel & White Bullicante with Gold Flecks
By Alfredo Barbini
Located in Palm Beach, FL
A stunning Alfredo Barbini Murano glass Conchiglia shell sculpture, crafted in Italy in the 1950s. This elegant shell-shaped piece features a harmonious blend of carmel and white ton...
Category
1950s Mid-Century Modern Vintage European Decorative Dishes and Vide-Poche
Materials
Glass, Art Glass, Blown Glass, Murano Glass
Set of Danish Aksini Black and White Vide-Poches
By Aksel Sigvald Nielsen, Aksini
Located in Copenhagen, DK
Set of two Danish midcentury modern decorative shiny black vide-poches with white incised lined decor designed and handmade by ceramic artist Aksel Sigvald Nielsen for Aksini Keramik...
Category
Mid-20th Century Mid-Century Modern European Decorative Dishes and Vide-Poche
Materials
Ceramic
Large Murano Multicolor Murrine Italian Art Glass Bowl by Dino Martens Avem
By Dino Martens
Located in Barcelona, ES
Colorful handblown Murano glass flower bowl with silver and gold flecks by Dino Martens. Italy, 1960s
This eye-catching large bowl is full of details. The interior part in shades of ...
Category
20th Century Mid-Century Modern European Decorative Dishes and Vide-Poche
Materials
Gold Leaf, Silver Leaf
Vide Poche or Decorative Basket, Swan Sculpture Shaped in Porcelain Italy, 1970s
Located in Auribeau sur Siagne, FR
This is a vide poche in porcalain, or a decorative bascket, as also an swan sculpture from the 1970s.
It has been made in Italy.
Category
1970s Hollywood Regency Vintage European Decorative Dishes and Vide-Poche
Materials
Porcelain
Kari Christensen for Royal Copenhagen Aluminia, Bird Decoration Oblong Dish 1965
By Kari Christensen
Located in Rothley, Leicestershire
Kari Christensen for Royal Copenhagen Aluminia. Glazed large oblong ceramic dish with bird decoration. Soft hues of blue and maroon from the Tenera series, circa 1965
Signed and num...
Category
Mid-20th Century European Decorative Dishes and Vide-Poche
Materials
Ceramic
Vintage French Decorative Platter by Albert Thiry 'circa 1970s'
By Albert Thiry
Located in London, GB
Midcentury decorative platter (circa 1970s) by Albert Thiry. A creamy-white glaze with touches of blue-grey provides the background for a colourful thistle motif in the centre recess...
Category
1970s Vintage European Decorative Dishes and Vide-Poche
Materials
Ceramic
Dunhill Art Nouveau Patinated Bronze Dish Vide Poche Ashtrays
By Dunhill
Located in Doylestown, PA
Rare pair of English Dunhill art nouveau patinated bronze ashtrays, catchalls with a female nude amongst waves in bas relief with organic form edge, London, England, early 20th centu...
Category
Early 20th Century Art Nouveau European Decorative Dishes and Vide-Poche
Materials
Bronze
Art Deco Basket Form Ceramic Dish of Entwined Lizards by Zsolnay Eosin
By Zsolnay
Located in New York, NY
This Lovely and captivating Art Deco Ceramic Dish by Zsolnay Eosin Originates from Hungary, Circa 1930. Reflective Greens and violets gleam from stunning surface of the iridescent me...
Category
1930s Art Deco Vintage European Decorative Dishes and Vide-Poche
Materials
Ceramic
Just Andersen large alloyed bronze bowl
By Just Andersen
Located in London, GB
A large alloyed bronze patinated dish bowl stamped Just Andersen Denmark and numbered 1736 X. Some wear to the patination which should be visible in the photos but otherwise a larger...
Category
1910s Aesthetic Movement Vintage European Decorative Dishes and Vide-Poche
Materials
Brass, Bronze
Just Andersen, Denmark 1930s Art Deco Pewter Squirrel Vide Poche #829
By Just Andersen
Located in Rothley, Leicestershire
Just Andersen, Denmark 1930s Art Deco pewter stylised squirrel vide poche
Circa 1930's
Stamped and numbered 829 on base
Diameter 7 inch, Height 2.5 inch
Remarkably good condition and...
Category
1930s Art Deco Vintage European Decorative Dishes and Vide-Poche
Materials
Pewter
Saint Gobain French moulded glass vide poche c.1970’s
Located in London, GB
French 1970’s clear moulded glass vide poche.
Category
Mid-20th Century Mid-Century Modern European Decorative Dishes and Vide-Poche
Materials
Glass
Le Corbusier for Lumax Modernist Glass Desk Tidy Catchall
By Lumax, Le Corbusier
Located in Atlanta, GA
This 1950s industrial thick molded glass desktop accessory, designed by one of the most influential architects of the 20th century, Le Corbusier, is the perfect desk tidy, ashtray, o...
Category
1950s Mid-Century Modern Vintage European Decorative Dishes and Vide-Poche
Materials
Glass
Georgian Mason's Ironstone Desert Dish or Plate Cross Fence gilded Ptn, Ca 1815
By Mason's Ironstone
Located in Lincoln, Lincolnshire
This is a very good early Mason's Ironstone pottery desert plate or dish in the Cross Fence gilded pattern, produced by the Mason's factory at Lane Delph, Staffordshire, England, cir...
Category
Early 19th Century Chinoiserie Antique European Decorative Dishes and Vide-Poche
Materials
Ironstone
Vintage Brass Bowl in the Shape of a Large Leaf, Italy, circa 1950
Located in North Hollywood, CA
Vintage Italian decorative mid-century bowl in the shape of a large leaf or shell.
Beautiful as a standalone center piece, vide poche, for jewelry, or small items on a desk, vanity,...
Category
Mid-20th Century Hollywood Regency European Decorative Dishes and Vide-Poche
Materials
Brass
Mid-Century French Cow Bide-Poche by Albert Thiry (circa 1960s)
By Albert Thiry
Located in London, GB
Mid-century French ceramic whimsical cow vide-poche (circa 1960s) by Albert Thiry. A chalk-white glaze provides the backdrop for a colourful flower motif in the centre recess of the ...
Category
1960s Vintage European Decorative Dishes and Vide-Poche
Materials
Ceramic
Bitossi by Aldo Londi Rimini Blu Large Ashtray Vide-Poche, Italy 1960s
By Aldo Londi, Bitossi
Located in Valencia, VC
Large Round Bitossi Ashtray by Aldo Londi – Rimini Blu, 1950s-60s
A stunning Mid-Century Bitossi ashtray by Aldo Londi, featuring the house’s signature Etruscan-inspired sgraffito d...
Category
1960s Mid-Century Modern Vintage European Decorative Dishes and Vide-Poche
Materials
Ceramic, Clay, Earthenware
Dramatic Statement Piece Centrepiece Ceramic Plate By DeSimone, Italy, c1960
By DeSimone
Located in Rothley, Leicestershire
Bold and so colourful large mid-century ceramic plate by DeSimone, Italy
Hand painted Yin and Yang stylised fish dominate this entire piece
Circa 1960's
Signed DeSimone, Italy
Height...
Category
Mid-20th Century Mid-Century Modern European Decorative Dishes and Vide-Poche
Materials
Ceramic
1960s Organic Modern Stoneware Large Dish By Nanni Valentini for Ceramica Arcore
By Ceramica Arcore, Nanni Valentini
Located in Aci Castello, IT
Refined centerpiece in porcelain stoneware, decorated in dark green and brown tones. Under the base, the manufacturer's trademark and paper label. "Arcore Ceramica" that was founded ...
Category
Mid-20th Century Organic Modern European Decorative Dishes and Vide-Poche
Materials
Stoneware
Four Antique Worcester Porcelain Bowls in Queen Charlotte Pattern England C.1775
By 1st Period Worcester Dr. Wall
Located in Katonah, NY
This set of four bowls was hand-painted in the Queen Charlotte pattern at Worcester, England, circa 1775.
Each bowl features swirling panels of delicate blue and pink flowers, meticu...
Category
Late 18th Century Antique European Decorative Dishes and Vide-Poche
Materials
Porcelain
Max Ingrand, Attb Glass Bowl/Dish/ Vide Poche, Freeform by Fontana Arte, Fx Mark
By Max Ingrand, Fontana Arte
Located in Los Angeles, CA
Beautiful freeform dish/Vide - Poche by Fontana Arte, with FX mark in bottom, shows light scratches near signature. Amazing green /blue color tone glass, very traditional for the ear...
Category
1950s Modern Vintage European Decorative Dishes and Vide-Poche
Materials
Glass
Art Deco Period Bowl with Sculpture - Monkey with Violin - Spelter and Marble
Located in Casteren, Noord-Brabant
A beautiful decorative bowl (ashtray) from the Art Deco period.
Made of Portoro Nero marble, with a cute little sculpture of a monkey with a violin. The sculpture is made of zamak (s...
Category
1920s Art Deco Vintage European Decorative Dishes and Vide-Poche
Materials
Marble, Spelter
Multicolored Murano Glass Plate by Berit Johansson for Salviati, 1991
By Berit Johansson, Salviati
Located in Varese, Lombardia
Murano glass centerpiece dish designed by Berit Johansson for Salviati in 1991. Signature of the maker engraved on the back.
Perfect condition.
Category
1990s Post-Modern European Decorative Dishes and Vide-Poche
Materials
Murano Glass
1940's Argenta Stoneware Plate by Wilhelm Kåge
By Wilhelm Kage, Gustavsberg
Located in New York, NY
1940's Argenta stoneware plate with female siluett decor by Wilhelm Kåge for Gustavsberg. The now iconic Argenta stoneware collection with its green gl...
Category
1940s Scandinavian Modern Vintage European Decorative Dishes and Vide-Poche
Materials
Ceramic
Jean-Elisée Puiforcat Silver and Ebony Vide Poche circa 1930.
By Jean Puiforcat
Located in CA, CA
A small silver and ebony dish made by Jean-Elisée Puiforcat circa 1930. French Minerva hallmark, goldsmith and signed "Jean E. Puiforcat".
Gross weight : 3,39 Oz
Category
1930s Art Deco Vintage European Decorative Dishes and Vide-Poche
Materials
Silver
Set of Five Purple Delft Dishes Hand Painted 18th Century Circa 1770
By Hugo Brouwer
Located in Katonah, NY
A set of five antique Dutch Delft dishes beautifully hand painted with manganese-based purple.
The dishes show a peony plant in full bloom.
The maker was Hugo Brouwer. Brouwer created the design, and each dish would have been hand-painted in his factory, The Dreye Porceleyne Flesschen, using a stencil of his design.
Each dish is signed with Brouwer's H-B mark.
Dimensions: diameter 9"
Condition: Excellent
Price: $500 for the 5 plates
Background of Hugo Brouwer:
Maker: Hugo Brouwer (active 1760–1788) at The Dreye Porceleyne Flesschen (The Thee Porcelain Bottles) factory.
Ref: C.H. De Jonge...
Category
Late 18th Century Rococo Antique European Decorative Dishes and Vide-Poche
Materials
Delft
Small Italian Beige and Burgundy Marble Lobed Basin or Vide Poche
Located in Dallas, TX
Hand-carved in Italy during the 1900’s, this small marble lobed basin would make a great vide-poche. A vide-poche (literally “empty pocket”) is a small storage bowl for everyday items, such as car keys, loose change, wallets, etc.
A marble basin of this size might have originally been used in a Catholic church as a holy water vessel. The gadrooned lobes carved along the outside give the appearance of a stylized scalloped shell. On the back of the shell is an excavated block of marble, which is how the basin would have been affixed to a wall. The beautiful beige colored marble with burgundy inclusions and white veining has been carved with a quarter round molding along the rim. A versatile item, our small Italian marble shell basin...
Category
20th Century European Decorative Dishes and Vide-Poche
Materials
Marble
Decorative Object Vide-Poche Bowl Flavio Poli Murano Glass Midcentury Italy 1960
By Flavio Poli
Located in Palermo, IT
Rare vide-poche/bowl of its kind designed by the well-known Italian designer Flavio Poli and produced in the 1960s.
The dodecagonal-shaped object was made in multicolored faceted Mur...
Category
Mid-20th Century Mid-Century Modern European Decorative Dishes and Vide-Poche
Materials
Murano Glass
Vintage Danish Bronze Zodiac Dish from Nordisk Malm, 1940s
Located in Esbjerg, DK
Bronze bowl/dish/ashtray with Zodiac motifs, manufactured and designed by Nordisk Malm in Denmark in the late 1940s
Category
1940s Art Deco Vintage European Decorative Dishes and Vide-Poche
Materials
Bronze
1880s Antique Victorian Sterling Silver Gilt Tazzas / Centerpieces
By Frederick Brasted
Located in Jesmond, Newcastle Upon Tyne
A magnificent, fine and impressive, pair of antique Victorian English sterling silver gilt tazzas / centerpieces; an addition to our silverware collection.
...
Category
1880s Victorian Antique European Decorative Dishes and Vide-Poche
Materials
Silver, Sterling Silver
Antique 19th Century Vienna Portrait Plate
Located in New Orleans, LA
This is a beautiful plate, executed to museum quality standards.
Category
Late 19th Century Antique European Decorative Dishes and Vide-Poche
Materials
Porcelain