CircleSafe(R) 850AX is an aerosol spray can of Mi-Glow(R) 600 red particles and CircleSol Mâ¢, a refined petroleum distillate. It is designed to be used with visible light inspection for detecting discontinuities found in structural fabrications and weldments. Higher particle concentration provides heavier indication buildup for easy detection. The carbon dioxide propellant reduces combustible hazard. CircleSafe(R) 850AX can be further enhanced when used with a UV-A light or blue light.