Paul Mayer tested several products that are marketed or reputed as products that are capable of marking on metal using a CO2 laser in this article.
7 Considerations Before Laser Engraving Metals
Brilliance Laser Ink Stainless Steel Black Metal Ink Aerosol– Ultimate 3D Printing Store
CO2 Metal Marking Spray with a Laser
CO2 Metal Marking Spray with a Laser
Co2 Laser Engraving On Metal - Laser Marking Spray
China Customized CO2 Laser Marking Machine for Leather Manufacturers, Suppliers - Kelier
OMTech Laser Marking Spray, Metal Laser Marking Fluid for CO2 Laser Engravers, 2×13oz Aerosol High Contrast Spray for Black Laser Engraving Metal, Laser Ink Agent for Aluminum Stainless Steel Brass
OMTech CO2 Laser Metal Marking Spray Black Laser Agent for StainlessSteel Brass.
RF Metal Tube CO2 Laser Marking Machine 30W for Wood Clothing Fabric Marking and Engraving - China Enclosed Cover Laser Marker, Laser Marking Machine