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How do you mark metal with a normal CO2 laser?
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Most CO2 lasers used by hobbyists, maker spaces, and small businesses aren't intended for use with metal.  An alternative to actually engraving the metal is to use a marking chemical that bonds to the metal when the laser is applied.

There are several options that work to varying degrees, at a range of costs, and intended for various metals.

Dry Moly is an inexpensive lubricant that works well as a marking material on stainless steel. View on eBay

CerMark is a leading commercial product designed for this purpose.  There are various types of CerMark that work on a variety of metals. View on eBay

Now here's a weird one, apparently mustard can be used to engrave on metal too!

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