Question 1

Is all blue glass cobalt?

Accepted Answer

No, not all blue glass is cobalt glass. Only those made with cobalt oxide can be called cobalt. In some pieces, the presence of copper oxide accounts for the color, however, cobalt glass is much more common. You'll find a collection of cobalt glass on 1stDibs.

Question 2

How do you identify cobalt blue glass?

Accepted Answer

If your glass has a blue tint to it, it is likely cobalt blue glass. There are three shades of cobalt glass; dark cobalt, which has a slight purplish hue, light or cornflower blue and medium blue. To verify its authenticity, check with an appraiser. You can also shop a collection of cobalt blue glass from some of the world’s top sellers on 1stDibs.

Question 3

How old is cobalt blue glass?

Accepted Answer

How old cobalt glass is varies greatly. Ancient Mesopotamian examples exist from roughly 2000 BC. In China, cobalt glass became common during the Zhou Dynasty, which lasted from 1122 to 221 BC. European cobalt glass may date back to as early as the 15th century. Shop a collection of antique cobalt glass on 1stDibs.

Question 4

How can I tell if a glass is cobalt blue?

Accepted Answer

Cobalt blue glass is a deep blue glass that often gets its color by the addition of cobalt oxide in the molten glass mixture when the glass is being formed. The best way to identify cobalt blue glass is by the color. Shop a collection of cobalt blue glass from some of the world’s top sellers on 1stDibs.

Question 5

Does cobalt make glass blue?

Accepted Answer

Yes, cobalt oxide makes glass blue. Different amounts of cobalt can be used to create more saturated levels of blue or to simply neutralize yellow for a more clear finish. Copper oxide can also be used to create a blue tinted glass. Shop a collection of cobalt glass from some of the world’s top sellers on 1stDibs.

Question 6

What is the blue and white ceramic called?

Accepted Answer

The blue and white ceramic pieces are called Delftware or faience. Delftware is a type of tin-glazed earthenware in which a white glaze is applied and then decorated with a metal oxide, such as a cobalt oxide, which gives this pottery its gorgeous blue color. Shop beautiful Delftware and faience pieces on 1stDibs.

Question 7

What is the historical significance of blue and white in ceramics?

Accepted Answer

In China, the art of making white porcelain with local kaolin produced attractive pieces with a luxe white finish. When they learned that cobalt oxide was the only pigment that could withstand the high firing temperatures of porcelain, a new type of ceramic entered the market. Blue and white porcelain first appeared in the 14th century in China. This technique worked its way across the globe. Shop a collection of expertly vetted porcelain from some of the world’s top sellers on 1stDibs.

Question 8

What are the Dutch blue and white ceramic pieces called?

Accepted Answer

Dutch blue and white ceramic dishes are called Delftware. Made in the Netherlands, the dishes are hand-painted and glazed using a centuries-old process involving clay and multiple glazes. Each piece is one-of-a-kind. You can shop a collection of Delftware from some of the world’s top sellers on 1stDibs.

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