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Glass Making Shop - not open for business yet
Roman Glassmaking
The natural color of glass is green or greenish-blue because there is iron oxide in the sand. To get clear glass manganese is added, but if twice the amount is added then you get purple glass. For blue glass add cobalt, for red glass add copper or gold dust. This made red glass very expensive. For yellow glass add silver, and for white glass add tin. If you add too much of any color or chemical element then you get black glass.
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