[Double Helix Glassworks]

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This chart shows strain data collected during tests during which a single manufacturer's colors were tested against their own clear. The purpose of these tests was for us to determine the general range of expansions within each manufacturer's line of glass. No company names or product numbers are listed, but the glasses are displayed from left to right in numerical order based on their stock number. (xxx004 - xxx999). Falling about in the the middle of the chart are the "specials", cadmium colors with stock numbers in the "xxx400"'s. You will note very high strain levels between these colors and the clears made by the same factory. When we examine the raw data, we found that certain colors in that color group had strain levels far outside of "safe" parameters. In fact, some of the samples are absent from the chart, as the fused samples shattered upon cooling, which gave us a (false) net strain reading of "0", as the strain was relieved by the breakage. This data would tend to support the anecdotal reports regarding certain colors' suitability to deep encasement.
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Jed at Double Helix

(technical note : Negative psi numbers indicate that the color tested "softer", or higher expansion, than the control clear. Generally 1000 psi total strain is considered the maximum "safe" level before breakage from internal strain. The tests we performed are indicative only of the particular lot or batch of glass that we tested at that time.)