A light transparent yellow with a purple haze which can develop a light white and yellow mix. A reducing flame will give the surface a metallic sheen. This color seems light from within.
Momentive GE214 Quartz Rod & Tubing Corning Pyrex Borosilicate Glass Clear Rod & Tubing - 33 Coe Borosilicate Colored Glass Rod and Tubing - 33 Coe Glass Ground Joints - 33 Coe
J Young Valves Golden Gate Tubing Borosilicate Profile Tubing - 33 Coe Asian Borosilicate Colored Glass Tubing & Rod - 33 COE