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Krosno Glass S.A., commonly known as Krosno, is a glassware and crystalware company from Poland. [1] [2] It has been in operation since 1923 and specializes in the production of high-quality glass accessories or liquid vessels such as jugs, vases, carafes, decanters and chalices as well as stemware and tumblers for serving spirits. [3]
Cobalt glass—known as "smalt" when ground as a pigment—is a deep blue coloured glass prepared by including a cobalt compound, typically cobalt oxide or cobalt carbonate, in a glass melt. Cobalt is a very intense colouring agent and very little is required to show a noticeable amount of colour. Cobalt glass plates are used as an optical ...
Cobalt blue, a pigment of cobalt oxide-aluminium oxide, was a favourite of Auguste Renoir and Vincent van Gogh. It was similar to smalt, a pigment used for centuries to make blue glass, but it was much improved by the French chemist Louis Jacques Thénard, who introduced it in 1802. It was very stable but extremely expensive.
It is uncertain when Bristol blue glass was first made but the quality and beauty of the glass swiftly gained popularity, with seventeen glass houses being set up in the city. [3] Lazarus and Isaac Jacobs were the most famous makers of Bristol blue glass in the 1780s. Lazarus Jacobs was a Jewish immigrant to Bristol from Frankfurt am Main, Germany.
After 1915, he introduced basic glass colors into regular production, they are given attractive gem names - purple Ametyst, dark green Smaragd, brownish-yellow Topas and cobalt-blue Saphir. In 1923 he added the yellow-green Radion colored with uranium compounds and at the same time black Hyalith glass, though only in small amounts.
Historically, a relatively narrow range of colours could be achieved with underglaze decoration, where the coloured pattern is applied before glazing, notably the cobalt blue of blue and white porcelain. Many historical styles, for example mina'i ware, Imari ware, Chinese doucai, and wucai, combine the two types of decoration. [1]
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