Green Blue Copper Vase by Graeme Storm - 23.5 cm
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A Graeme Storm trumpet vase, stoneware. Flared vase with arched cut pedestal base. Green blue copper carbonate glaze with manganese partial overglaze. Impressed maker's mark, height 23.5 cm, depth 22 cm
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- Overglaze on Porcelain - Overglaze decoration on porcelain refers to a decorative technique where designs are painted onto a fired and glazed porcelain surface, and then fired again at a lower temperature to fuse the decorative design onto the glaze surface. This technique allows for a wide range of colors and intricate designs that would not be possible with underglaze decoration, which is applied before the glaze is fired.
- Manganese Glaze - A manganese glaze contains manganese dioxide as a colorant. When fired at high temperatures, the manganese dioxide in the glaze reacts with the clay body to create a range of colors, including brown, black, purple, and deep red.
Manganese glazes have been used to decorate ceramics for thousands of years, and they have been particularly popular in Chinese and Korean pottery. In China, manganese glazes were first used during the Song dynasty (960-1279 AD), and they were later used in the production of Jun ware during the Ming dynasty (1368-1644 AD). In Korea, manganese glazes were used to decorate celadon pottery during the Goryeo dynasty (918-1392 AD).
The glaze can be applied to pottery using a variety of techniques, including brushing, pouring, and spraying. The glaze can be applied alone or in combination with other glazes to create a range of effects, including speckled or mottled surfaces. However these glazes can be difficult to control, as they tend to be very fluid and can easily run or drip during firing. However, this fluidity can also be used to create interesting effects, such as the "hare's fur" pattern that is often seen in Chinese tea bowls.
Manganese glazes are still in use by potters and ceramic artists to create unique and beautiful surfaces on their work.
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