Cermark Black marking paste 500g 

Solvent-based for easy handling before marking. Cermark metal marking pastes also allow most metals to be marked using a CO2 laser engraver. Similar to TherMark liquids, the Cermark products contain a hardener that allows the products to be easily handled prior to marking with your laser. The final result is the same permanent black marks on a range of bare metals. Good for CO2 lasers, 25W and above.