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In the following color descriptions, the different coloring (and de-coloring) agents or compounds for the different colors are briefly noted.This is just informational because the actual chemistry is of little utility and glass colors only contribute a little to the process of dating or typing historic bottles.With higher amounts of iron or higher oxidation of the iron, darker greens will usually occur (Toulouse 1969a; Jones & Sullivan 1989)).In order to create other colors, the iron needs to be variably neutralized and appropriate colorizing agents or compounds added to achieve the desired color.

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The silica (silica dioxide) typically makes up 60-80 % of the glass composition and is primarily derived from sand.Glass which is composed of pure silica (99.9% ) would be colorless glass.However, making glass from pure silica is not practical or commercially viable because of the prohibitive expense of acquiring such in its pure state and the much higher temperatures needed to properly melt.Glass composition formulas were (and probably still are) closely held glassmaker secrets as the experience of extensive trial and error experimentation in glass making was not readily shared with others.Variations in glass color resulted from a myriad of different causes including the strata of the sand source, the mineral in the soil of the of the trees burned to produce "potash" (an "flux" alternative to soda), and many others known and unknown (Toulouse 1969a).

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