Fingerprints of High-Temperature Attack of Sodium Vapor onto Quartz Surface
Sudden boiling of liquid sodium (b.p. = 1156 K at 1 atm) inside the all quartz-made smelting/evaporation chamber results in condensation and high-temperature reaction of sodium vapor with the inner wall surface. The attack and reaction becomes more aggressive with increasing vapor temperature. The condensation "fingerprints" express different color bands from silver, metallic, milky, brown, orange, red, and black with increasing level of the sodium attack and reaction on the surface.
