Dating glass by color archaeology

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This is because water is the primary cause of deterioration of glass.

Frequently the leached crust is found to have a laminar structure with individual parallel layers ranging in thickness from less than 1 μm to about 25 μm.However, under the right conditions any glass can show signs of deterioration.In general, glass found in dry soils is in better condition than glass found in moist soils.“The laminated structure can cover all the fragment homogeneously or it may start at one single point on the surface, which leads to circular patterns.” In some cases the alkali-deficient layers protect the remaining glass from further deterioration, or slow down the access of water to the glass and thus slow down the formation of new layers.Whether the crust is protective or not depends primarily on the composition of the glass and the p H of the leaching solution.

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