Corning Pyrex Borosilicate Glass Clear Rod & Tubing - 33 Coe Borosilicate Colored Glass Rod and Tubing - 33 Coe Soft Colored Glass System 96 COE Soft Colored Glass - 104 Coe
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Paul has reformulated one of his old favorites and dubbed it. Penumbra, from the astronomy term for a partial eclipse shadow. Penumbra is a reactive, striking "silvered" cobalt blue, which reduces and oxidizes for a range of colors and effects. This sample includes some clear glass; you can see a mirror finish at the edges.
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25 and more less 30%