What types of metal can be etched with your etching machines?

Virtually all metals can be etched but some etch more easily than others, commonly etched metals include:-

Stainless steel

Other steels including Tool Steel, Mild Steel, Carbon Steel

Various Nickel Alloys

Copper

Inconel

Copper Alloys including Brass, Phospor Bronze, Nickle Silver

Aluminium and Aluminium Alloys (Care needs to be taken as the formation of Aluminium Oxide is Exothermic process so appropriate cooling coils need to be utilised)

Silver and Silver Alloys

Gold and Gold Alloys