The Chemistry of Colored Glass
By Andy Brunning
Glass is colored in 3 main ways. It can have transition or rare earth metal ions added; it can be due to colloidal particles formed in the glass; or it can be due to particles which are colored themselves. This graphic shows some of the typical chemical elements that are used to color glass.
These are typical colors, and can be affected by the type of glass as well as the concentration of the colorant. Combination with other elements and compounds can also have an effect on the final coloration of the glass.
Soda-Lime Glass Composition
SiO2 70-74% SILICON DIOXIDE | CaO 10-14% CALCIUM OXIDE | Na2O13-16% SODIUM OXIDE
Soda-lime glass is the most common glass type, making up an estimated 90% of all manufactured glass. Its uses include containers, windows, bottles, and drinking glasses. The above percentages are a general composition only; other compounds are also present in smaller amounts.
This article appeared in the Beachcombing Magazine July/August 2020 issue.
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