Trautman Penumbra - Tubing Tube Standard

Variant details: Tubing Tube Standard — Form: Tube, Quality: First Quality, Tube Type: Standard Tube, Weight: 1.05 lb, Dimensions: 15 x 1.5 x 3.5 in, Color Variant: Penumbra.

Named for the shadowy edge of a lunar eclipse, Penumbra is a reactive “silvered” cobalt blue, reformulated from one of Paul’s old favorites. Different colors are produced from reduction or oxidation, primarily a wide variety of blues and greens. Reduction can create a luster that you can trap under a clear encasement however, surface haze doesn’t burn off as easily as amber/purple type glasses.