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Several examples of glass with a known burial date support this theory.However, for the majority of objects the number of layers does not correlate to the estimated number of years of burial.
Whether the crust is protective or not depends primarily on the composition of the glass and the p H of the leaching solution.
Too little silica and more or less than the optimum 10 % of lime are especially detrimental for the stability of a glass.
Soda glass is almost twice as stable as potash glass.
The final crust can vary in thickness from microscopically thin to so thick that it can easily be seen without a microscope.
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.