CircleSafe(R) 820AX is an aerosol spray can of Mi-Glow(R) 106 black particles and CircleSol Mâ¢, a refined petroleum distillate. It is designed to be used with visible light inspection for detecting discontinuities found in finished products and structural fabrications. Higher particle concentration provides heavier indication buildup for easy detection. The carbon dioxide propellant reduces combustible hazard. CircleSafe(R) 820AX can be used with Mi-Glow(R) WCP.