Etching Nude Prints
46
to
116
427
263
55
180
459
205
7
414
116
105
23
16
Overall Height
to
Overall Width
to
205
182
118
26
18
14
6
5
3
1
1
584
422
350
220
194
160
135
94
86
36
17
13
12
10
8
8
8
8
7
7
5
17
580
91
10
24
42
44
10
13
99
169
36
18
4
72
29
27
26
24
887
693
486
174
167
Medium: Etching
Nudes - Suite of 5 Etchings by Leonard Tsuguharu Foujita - 1930s
Located in Roma, IT
Nudes is a series of five etchings on paper realized by by Leonard Tsuguharu Foujita.
Conditions are very good.
Included Passepartout: 40 x 30
The artworks represent different sce...
Category
20th Century Etching Nude Prints
Materials
Etching
Garden, by Trevor Southey
Located in Palm Springs, CA
Male nude etching by Trevor Southey.
Trevor Southey was born in Rhodesia, Africa (now Zimbabwe) in 1940. His African heritage can be traced to European colonists who settled in Cape...
Category
1990s Contemporary Etching Nude Prints
Materials
Etching
Ernst Fuchs Sphinx Mystagoga Surreal Color Etching Vienna Fantastic Realism 1967
By Ernst Fuchs
Located in Meinisberg, CH
Ernst Fuchs
(Austrian, 1930 - 2015)
The Sphinx Mystagogo
Sheet Nr. 6 from the Folio “Die Sieben Bilder und Sprüche der Sphinx”, published in Autumn of 1967 by Galerie Sydow in Frankfurt, Germany.
• Aquatint Etching
• Ed. 79/99
• Sheet ca. 59 x 41.5 cm
• Plate signed
• Signed & numbered by the artist in pencil
Ernst Fuchs was an Austrian painter, draftsman, printmaker, sculptor, architect, stage designer, composer, poet, and one of the founders of the Vienna School of Fantastic Realism.
I discovered him through H.R. Giger ‘s work, who himself was greatly inspired by the creations of Fuchs and on several occasions exhibited his friend ‘s art in his museum, the Château St-Germain, Gruyères, Switzerland.
I actually own the original folio box...
Category
1960s Surrealist Etching Nude Prints
Materials
Aquatint, Paper, Ink, Etching
Vibration - Original handsigned etching / 90ex
Located in Paris, FR
Mikio WATANABE (1954-)
Vibration, 2008
Original etching
Signed and dated 2008 in pencil
Numbered / 90 ex
On vellum 25 x 33.5 cm (c. 9.8 x 12.9 inch)
Excellent condition
Category
Early 2000s Modern Etching Nude Prints
Materials
Etching
Femme Agenouillée sur le Genou... - Etching by Aristide Maillol - 1927
Located in Roma, IT
Signed with monogram by the artist. Edition not avaible.
Ref. Guérin 327.
Sheet in excellent conditions.
Editions H. Petiet, Paris.
Category
1920s Modern Etching Nude Prints
Materials
Etching
'The Female Gaze', NYMoMA, California College of Arts and Crafts, SFAI, CPLH
By Gerald Gooch
Located in Santa Cruz, CA
Signed lower center, 'Gooch', for Gerald Gooch (American, born 1933) with number and limitation, '5/16' and dated 1965.
Born in Mainington, West Virginia, Gerald Gooch first studied...
Category
1960s Modern Etching Nude Prints
Materials
Etching, Paper, Aquatint
Alberto "El Cuervo" Bustillos, Te siento siempre, 2007, n2
Located in Miami, FL
Alberto "El Cuervo" Bustillos (Mexico, 1950)
'Te siento siempre', 2007
etching, aquatint on paper Deponte 300 g.
12.3 x 10.3 in. (31 x 26 cm.)
ID: CUR-107-2
Hand-signed by author
Category
Early 2000s Contemporary Etching Nude Prints
Materials
Etching, Paper, Aquatint
The Dove-like Eyes on the Bride, Original Salvador Dali etching, Hand-signed
Located in PARIS, FR
Dimensions include the frame.
"The Dove-like Eyes on the Bride" is a lithograph created by Salvador Dalí in 1971, during a period when he was deeply engaged in exploring the themes ...
Category
1970s Surrealist Etching Nude Prints
Materials
Etching
Ex Libris. Paper, etching, 11x7 cm
Located in Riga, LV
Ex Libris A. Zuyeva
Paper, etching, 11x7 cm
Category
1990s Jugendstil Etching Nude Prints
Materials
Etching, Paper
Deux Femmes Nues - Etching by Pablo Picasso - 1930
Located in Roma, IT
Hand signed in ink. Edition of 125 prints.
Very good condition.
Catalogue Bloch n.132.
Category
1930s Cubist Etching Nude Prints
Materials
Etching, Paper
Three graces. Paper, etching, 12x11cm
Located in Riga, LV
Three graces. Paper, etching, 12x11cm
Category
1990s Jugendstil Etching Nude Prints
Materials
Etching, Paper
L'Aigle Mademoiselle - Etching by Hans Bellmer - 1968
By Hans Bellmer
Located in Roma, IT
Hand Signed. From the Portfolio "Petit Traité de Morale", Paris, Editions Georges Visat, 1968.
Copy on Japon Nacré from the additional suite. Includes passepartout.
Hans Bellmer wa...
Category
1960s Surrealist Etching Nude Prints
Materials
Etching, Paper
Paesaggio Urbano - Etching by Diego Donati - 1950s
Located in Roma, IT
Paesaggio Urbano is an Artwork realized in 1950s, by Diego Donati (1910-2002) from Italy.
Etching on ivory paper. Hand Signed and titled on the lower margin. Numbered 52/100 on th...
Category
1950s Modern Etching Nude Prints
Materials
Etching, Paper
Homme nu avec femme ivre et jeune flutiste
Located in Fairlawn, OH
Homme nu avec femme ivre et jeune flutiste
Etching, 1955
Signature stamp lower right (see photo)
Annotated in penci lower leftl: "epreuve d'artiste" (see photo)
Inventory number vers...
Category
1950s Modern Etching Nude Prints
Materials
Etching
Baigneuse Debout à Mi - Jambes - Etching by Pierre Auguste Renoir - 1910
Located in Roma, IT
Cagnes-sur-Mer 'Baigneuse Debout à Mi-Jambes' (1910) is an artwork realized by Pierre-Auguste Renoir (1841 Limoges - 1919).
Etching and drypoint on paper.
Image size 20.5 x 15 cm,...
Category
1920s Impressionist Etching Nude Prints
Materials
Etching
Garden With Henry, by Peter Milton
By Peter Milton
Located in Palm Springs, CA
Medium: Resist Ground Etching & Engraving
Image Size: 9.5 x 12 inches
Year: 1993
Signed, titled and numbered by the artist, this print was specially made by Milton to accom...
Category
Early 2000s Contemporary Etching Nude Prints
Materials
Etching, Engraving
Aline et Valcour - Etching by Hans Bellmer - 1968
By Hans Bellmer
Located in Roma, IT
Hand Signed. From the Portfolio "Petit Traité de Morale", Paris, Editions Georges Visat, 1968.
Copy on Velin d'Arches. Includes matting.
Hans Bellmer was a German artist, who, when...
Category
1960s Modern Etching Nude Prints
Materials
Etching, Paper
Les Crimes de l'Amour - Etching by Hans Bellmer - 1968
By Hans Bellmer
Located in Roma, IT
Hand Signed. From the Portfolio "Petit Traité de Morale", Paris, Editions Georges Visat, 1968.
Copy on Velin d'Arches. Includes matting.
Hans Bellmer was a German artist, who, when...
Category
1960s Modern Etching Nude Prints
Materials
Etching, Paper
Juliette ou les Prospérités du Vice - Etching by Hans Bellmer - 1968
By Hans Bellmer
Located in Roma, IT
Hand Signed. From the Portfolio "Petit Traité de Morale", Paris, Editions Georges Visat, 1968.
Copy on Japon Nacré from the additional suite. Includes matting. Excellent conditions....
Category
1960s Modern Etching Nude Prints
Materials
Etching, Paper
Les 120 Journées de Sodome - Etching by Hans Bellmer - 1968
By Hans Bellmer
Located in Roma, IT
Hand Signed. From the Portfolio "Petit Traité de Morale", Paris, Editions Georges Visat, 1968.
Copy on Japon Nacré from the additional suite. Includes matting.
Hans Bellmer was a G...
Category
1960s Modern Etching Nude Prints
Materials
Etching, Paper
Dialogue Entre un Prêtre et un Moribond - Etching by Hans Bellmer - 1968
By Hans Bellmer
Located in Roma, IT
Hand Signed. From the Portfolio "Petit Traité de Morale", Paris, Editions Georges Visat, 1968.
Copy on Japon Nacré from the additional suite. Includes matting
Hans Bellmer was a Ge...
Category
1960s Modern Etching Nude Prints
Materials
Etching, Paper
La Philosophie dans le Boudoir - Etching by Hans Bellmer - 1968
By Hans Bellmer
Located in Roma, IT
This beautiful artwork is hand-signed. It comes from the Portfolio "Petit Traité de Morale", Paris, Editions Georges Visat, 1968.
Copy on Velin d'Arches. Includes matting.
Hans Bel...
Category
1960s Modern Etching Nude Prints
Materials
Etching, Paper
Salvador Dali - Girl on Rhinoceros Horn
Located in Collonge Bellerive, Geneve, CH
Salvador Dali - Girl on Rhinoceros Horn - Original Etching
Dimensions: 38 x 28 cm
Edition: 390
1967
On Rives Vellum
Signed in the plate
References : Fi...
Category
1960s Surrealist Etching Nude Prints
Materials
Etching
Book of Prints -- Poor Man's Bible
Located in Troy, NY
While living and working in Soho, NYC, Japanese artist Kawakami produced these masterful etchings. These were obtained by a fellow artist of the Abstract New York School of Painting,...
Category
1970s Contemporary Etching Nude Prints
Materials
Paper, Etching
The Magicians Vanite
Located in Hollywood, FL
ARTIST: Salvador Dali
TITLE: The Magicians Vanite
MEDIUM: Etching
SIGNED: Hand Signed
PUBLISHER: Editions Argillet, Paris
EDITION NUMBER: 33/100
MEASUREMENTS: Paper: 11.2" x 1...
Category
1960s Surrealist Etching Nude Prints
Materials
Etching
Three Graces of Cova d’or
Located in Hollywood, FL
ARTIST: Salvador Dali
TITLE: Three Graces of Cova d'or
MEDIUM: Etching with embossed verso
SIGNED: Hand Signed
PUBLISHER: Galerie des Quatre Mouvements
EDITION NUMBER: 68/90
ME...
Category
1970s Surrealist Etching Nude Prints
Materials
Etching
The Mythology Judgment of Paris
Located in Hollywood, FL
ARTIST: Salvador Dali
TITLE: The Mythology Judgment of Paris
MEDIUM: Etching
SIGNED: Hand Signed
EDITION NUMBER: 141/150
MEASUREMENTS: 18" x 29...
Category
1960s Surrealist Etching Nude Prints
Materials
Etching
Adolescence. (Kathleen Nancy Woodward).
Located in Storrs, CT
Adolescence. (Kathleen Nancy Woodward). 1932. Etching. Fletcher 75 state vi. Image: 14 3/8 x 10 7/16 (sheet 16 3/8 x 12 1/4. Total edition 91). Illustrated: Guichard, British Etchers...
Category
1930s Modern Etching Nude Prints
Materials
Etching
Akt mit Fächer
By Marc Chagall
Located in New York, NY
A superb, richly-inked impression of this extremely scarce, early etching and drypoint. With burr throughout and crisp plate edges. First state (of 2). Edition of 100. Signed in penc...
Category
1920s Expressionist Etching Nude Prints
Materials
Drypoint, Etching
Nymphee, Surrealist Etching by Roberto Matta
Located in Long Island City, NY
"Nymphee" is a colorful Roberto Matta etching from his Requiem pour la Fin des Temps suite. The print is signed and numbered (44/100) in pencil w...
Category
1970s Surrealist Etching Nude Prints
Materials
Etching, Aquatint
A Greek Idyll - Proof Etching by Robert Walker MacBeth after G F Watts
Located in London, GB
ROBERT WALKER MACBETH
(British 1848-1910)
After GEORGE FREDERIC WATTS
(British 1817-1904)
A Greek Idyll
Proof etching
Signed in pencil by both the artist l.l. and engraver l.r.
Framed
Plate size 42 by 54 cm., 16 ½ by 21 ¼ in.
(frame size 72.5 by 85 cm., 28 ½ by 33 ½ in.)
After Watt’s 1894 painting...
Category
Early 1900s Pre-Raphaelite Etching Nude Prints
Materials
Etching
Sonia
By Man Ray
Located in New York, NY
A very good impression of this color etching with aquatint. Signed and numbered 29/75 in pencil. Printed by Jacques David, Paris. Co-published by Leon Am...
Category
1970s Modern Etching Nude Prints
Materials
Color, Etching, Aquatint
Plate IV, Le Cocu Magnifique
Located in Fairlawn, OH
Plate IV, Le Cocu Magnifique
etching & aquatint, 1968
Unsigned on the print
Signed on the portfolio justification page (see photo)
From the unsigned edition of 200 impressions printe...
Category
1960s French School Etching Nude Prints
Materials
Aquatint
Untitled Nude, from Atelier International Portfolio by renowned realist artist
Located in New York, NY
Philip Pearlstein
Untitled Nude, from Atelier International Portfolio, 1985
Etching. on wove paper
Hand signed, numbered 78/85, and dated on the lower front with printer's and publisher's blind stamps.
30 × 22 1/2 inches
Unframed
This vintage (mid 1980s) etching by Philip Pearlstein is hand signed, numbered and dated from the edition of 85. The late Philip Pearlstein is one of the most renowned realist painters in the world, but has become best recognized of late as Andy Warhol's former roommate in Pittsburgh, who traveled together with Warhol to New York. The Warhol museum in fact hosted a show of the two unlikely artists and roommates.
Philip Pearlstein
Born in 1924 in Pittsburgh, Pennsylvania, USA, Philip Pearlstein died in 2022. He is considered to be one of the masters of new figuration and modernist realism. He has been examining the question of how the model is represented since the 1960s, his complex works straddling the line between naturalism, abstraction and hyperrealism. His still lives in oil feature nudes with mask...
Category
1980s Realist Etching Nude Prints
Materials
Etching
Poems Secrets Nude at The Fountain
Located in Hollywood, FL
ARTIST: Salvador Dali
TITLE: Poems Secrets Nude at The Fountain
MEDIUM: Etching
SIGNED: Hand Signed
PUBLISHER: Editions Argillet, Paris
EDITION NUMB...
Category
1960s Surrealist Etching Nude Prints
Materials
Etching
Salvador Dali - Marguerite - Original Etching
Located in Collonge Bellerive, Geneve, CH
Salvador Dali - Marguerite - Original Etching from "Faust" suite
Stamped signature, as issued
From the standard edition of 731
Dimensions: 38,5 x 28,5 cm
1969
References : Field 69-1...
Category
1960s Surrealist Etching Nude Prints
Materials
Etching
Petites Nus (From Appollinaire) D
Located in Hollywood, FL
ARTIST: Salvador Dali
TITLE: Petites Nus (From Appollinaire) D
MEDIUM: Etching
SIGNED: Hand Signed
PUBLISHER: Editions Argillet
EDITION NUMBER: 39/95
MEASUREMENTS: 15.2" x 11....
Category
1970s Surrealist Etching Nude Prints
Materials
Etching
Nude - Etching by Giacomo Porzano - 1972
Located in Roma, IT
Nude is an artwork realized by the Italian artist Giacomo Porzano (1925-2006), in 1972.
Mixed colored etching.
Hand signed and dated on the lower right margin.
Numbered on the lo...
Category
1970s Contemporary Etching Nude Prints
Materials
Etching
Nude with a Fan - Female Nude with Fan French Russian Ecole de Paris
By Marc Chagall
Located in London, GB
This original etching with drypoint is hand signed in pencil by the artist "Marc Chagall" at the lower right corner.
It is also hand numbered in pencil from the edition of 100, at t...
Category
1920s Modern Etching Nude Prints
Materials
Drypoint, Etching
Le Reppos du Guerrier
Located in Hollywood, FL
ARTIST: Salvador Dali
TITLE: Le Reppos du Guerrier
MEDIUM: Etching
SIGNED: Hand Signed
EDITION NUMBER: X/C
MEASUREMENTS: 17.7" x 25"
CONDITION: Excellent
AUTHENTICATION: Mu...
Category
1960s Surrealist Etching Nude Prints
Materials
Etching
La Venus aux Fourrures Woman on Horse
Located in Hollywood, FL
ARTIST: Salvador Dali
TITLE: La Venus Aux Fourrures Woman on Horse
MEDIUM: Etching
SIGNED: Hand Signed
PUBLISHER: Editions Argillet, Paris
EDITION NUMBER: 25/145
MEASUREMENTS:...
Category
1960s Surrealist Etching Nude Prints
Materials
Etching
La Venus Aux Fourrures Woman With Whip
Located in Hollywood, FL
ARTIST: Salvador Dali
TITLE: La Venus Aux Fourrures Woman with Whip
MEDIUM: Etching
SIGNED: Hand Signed
PUBLISHER: Editions Argillet, Paris
EDITI...
Category
1960s Surrealist Etching Nude Prints
Materials
Etching
Hommage a Albrecht Durer Renaissance
Located in Hollywood, FL
ARTIST: Salvador Dali
TITLE: Hommage a Albrecht Durer Renaissance
MEDIUM: Etching
SIGNED: Hand Signed
PUBLISHER: Vision Nouvelle
EDITION NUMBER: EA
MEASUREMENTS: 15.3" x 22.8"...
Category
1970s Surrealist Etching Nude Prints
Materials
Etching
La Venus Aux Fourrures Woman Holding Veil
Located in Hollywood, FL
ARTIST: Salvador Dali
TITLE: La Venus Aux Fourrures Woman Holding Veil
MEDIUM: Etching
SIGNED: Hand Signed
PUBLISHER: Editions Argillet, Paris
...
Category
1960s Surrealist Etching Nude Prints
Materials
Etching
Hommage a Albrecht Durer Sirene au Dauphin
Located in Hollywood, FL
ARTIST: Salvador Dali
TITLE: Hommage a Albrecht Durer Sirene au Dauphin
MEDIUM: Etching
SIGNED: Hand Signed
EDITION NUMBER: EA
MEASUREMENTS: 22.5" x 30.5"
YEAR: 1971
FRAMED:...
Category
1970s Surrealist Etching Nude Prints
Materials
Etching
Hommage a Albrecht Durer Venus Mars Cupidon
Located in Hollywood, FL
ARTIST: Salvador Dali
TITLE: Hommage a Albrecht Durer Venus Mars Cupidon
MEDIUM: Etching
SIGNED: Hand Signed
PUBLISHER: Vision Nouvelle
EDITION NUMBER: EA
MEASUREMENTS: 23" x ...
Category
1970s Surrealist Etching Nude Prints
Materials
Etching
Hommage a Albrecht Durer Triomphe de Venus
Located in Hollywood, FL
ARTIST: Salvador Dali
TITLE: Hommage a Albrecht Durer Triomphe de Venus
MEDIUM: Etching
SIGNED: Hand Signed
PUBLISHER: Vision Nouvelle
EDITION NUMBER: EA
MEASUREMENTS: 23" x 3...
Category
1970s Surrealist Etching Nude Prints
Materials
Etching
Peintre et modèle
Located in Barbizon, FR
Gravure originale tirée à 50 exemplaires, technique de l'aquatinte et de la pointe sèche, numérotée et signée au crayon par l'artiste.
Encadrée avec un cadre en bois et un verre musé...
Category
20th Century Cubist Etching Nude Prints
Materials
Drypoint, Aquatint
Alberto "El Cuervo" Bustillos, Te siento siempre, 2007, n3
Located in Miami, FL
Alberto "El Cuervo" Bustillos (Mexico, 1950)
'Te siento siempre', 2007
etching, aquatint on paper Deponte 300 g.
12.3 x 10.3 in. (31 x 26 cm.)
ID: CUR-107-3
Hand-signed by author
Category
Early 2000s Contemporary Etching Nude Prints
Materials
Etching, Aquatint, Paper
Erotica
By Leonor Fini
Located in Hollywood, FL
Artist: Leonor Fini
Title: Erotica
Medium: Etching
Signed: Hand Signed
Edition Number: 65/150
Measurements: 14" x 18"
Framed: 20.75" x 26"
Condition: Excellent. This piece has...
Category
Mid-20th Century Surrealist Etching Nude Prints
Materials
Etching
Ex Libris - Ernest Monteux- Etching by Michel Fingesten - 1930s
Located in Roma, IT
Ex Libris - Ernest Monteux is an Etching print created by Michel Fingesten in 1930s.
Hand signed on the lower margin. Numbered on the left corner, ex. 149/150
Good conditions.
Mi...
Category
1930s Symbolist Etching Nude Prints
Materials
Etching
Salvador Dali - Knight & Death, from "Faust"
Located in Collonge Bellerive, Geneve, CH
Salvador Dali - "Knight & Death" from Faust - Original Etching
With embossed signature (from the standard book edition of 731)
Dimensions: 38,5 x 28,5 cm
1969
References : Field 69-1...
Category
1960s Surrealist Etching Nude Prints
Materials
Etching
Nude - Etching by Sergio Barletta - 1974
Located in Roma, IT
Nude is an etching on cardoboard realized by Sergio Barletta in 1974.
sheet dimensions, 25 x 17 cm.
Edition XL/XL
Handsigned in pencil in the lower right margin.
Good condtions
Category
1970s Modern Etching Nude Prints
Materials
Etching
"Femme nue assise" original etching
Located in Henderson, NV
Medium: original soft ground etching. Catalogue reference: Delteil 12. Executed in 1906, this is a lifetime impression published in 1909 in Berlin by Cassirer for "Kunst und Kunstler...
Category
Early 1900s Impressionist Etching Nude Prints
Materials
Etching
Single Edition of Contemporary Shunga Book of Etchings -- O Man of Little Faith
Located in Troy, NY
While living and working in Soho, NYC, Japanese artist Kawakami produced these masterful etchings. These were obtained by a fellow artist of the Abstract New York School of Painting,...
Category
1970s Contemporary Etching Nude Prints
Materials
Etching, Paper
'Baigneuse Debout, à Mi-Jambes' — French Impressionism
Located in Myrtle Beach, SC
Pierre Auguste Renoir, 'Baigneuse Debout, à Mi-Jambes (Woman Bathing, Standing Up to Her Knees in Water)', 1910, etching, edition not stated, Delteil 23. Unsigned as published. A fin...
Category
1910s Impressionist Etching Nude Prints
Materials
Etching
Two Nude Me - Etching by Nicholas Cochin - 1755
Located in Roma, IT
Two Nude Men is an etching realized by Nicholas Cochin in 1755.
Signed on the plate.
Good conditions with central folding.
The artwork is depicted through confident strokes.
Category
1750s Modern Etching Nude Prints
Materials
Etching
'Old, ' original signed print by Judy Chicago from Madison Print Club
By Judy Chicago
Located in Milwaukee, WI
In the present work, Judy Chicago turns the subject of the female nude on its head: from the Renaissance though the twentieth century in Western art, the female nude was a favorite s...
Category
2010s Contemporary Etching Nude Prints
Materials
Mulberry Paper, Etching, Lithograph
Etching nude prints for sale on 1stDibs.
Find a wide variety of authentic Etching nude prints available on 1stDibs. While artists have worked in this medium across a range of time periods, art made with this material during the 21st Century is especially popular. If you’re looking to add nude prints created with this material to introduce a provocative pop of color and texture to an otherwise neutral space in your home, the works available on 1stDibs include elements of yellow, blue, orange and other colors. There are many well-known artists whose body of work includes ceramic sculptures. Popular artists on 1stDibs associated with pieces like this include Salvador Dalí, Pablo Picasso, Leo Guida, and André Derain. Frequently made by artists working in the Modern, Contemporary, all of these pieces for sale are unique and many will draw the attention of guests in your home. Not every interior allows for large Etching nude prints, so small editions measuring 0.03999999910593033 inches across are also available Prices for nude prints made by famous or emerging artists can differ depending on medium, time period and other attributes. On 1stDibs, the price for these items starts at $50 and tops out at $1,500,000, while the average work can sell for $800.
Recently Viewed
View AllMore Ways To Browse
Gold Bunny Rabbit
76 Oil Paint Brown
Long Champ
Outside Chairs
Ship In Storm
Stanley Hotel
Antique Post Impressionist Oil Painting
Marshall James
One Eyed Jack
Antique Oil Paintings Of Venice
Circle Tapestry
Vintage 70s Summer Fashion
Allen House
Essex Ma
Impressionist Painting Of Wildlife
May Milton
Northern Michigan Art
Hermosa Beach