Anonymous ID: 257999 Dec. 27, 2018, 7:43 p.m. No.4494410   🗄️.is 🔗kun   >>4439

>>4494244

It has to be from the ionization of oxygen. The energy levels are such that the ionized electrons emit blue light when moving to a lower and more stable energy level. Research luminescence and recombination, such as electron-hole recombination. Same concept, only with gases.