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Decol 98, Decol 100

Impurities such as residual iron in glass raw materials can affect the colour of the glass. There are two methods available to correct this colour contamination. A physical decolouriser, such as selenium, cobalt, chrome and manganese can be used to counteract this colour contamination by the production of their own and equally opposite colours. Whilst this then produces a clear glass, a dirty or grey texture can result.

Iron in its ferrous (Fe 2+) state produces a blue colour. In its ferric (Fe 3+) state, a yellow-green colour is produced that is 10 times less intense. This oxidation of the impurity (iron) is known as chemical decolourisation. By using a two-step process of both chemical and physical decolourisation the texture of the final glass is much cleaner. By using Decol 98, toxic additions of arsenic (As) and antimony (Sb) are eliminated and additions of selenium and cobalt are much reduced. Additionally, both As and Sb are known to eliminate the complementary colour introduced by selenium. Decol 98 does not have any negative effect on selenium.