i do a modified version of this technique. i arrange color rods, or color strips that i cut from sheet glass, on a heated cane marver. the cast iron cane marver (steinert) is heated on a hot plate to 1100F and then picked up on a 1st or 2nd gather. to get to 1100F, i have an insulated lid on top of the hot plate/cane marver. i posted a picture of some color rods (bullseye) arranged in a spectral pattern.
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