Hello For etching stainless steels, and also HSS steel you need H2So4
and HCl in rather high concentrations
55% water add
25% concentrated H2So4 and 20% concentrated HCl
heating up increases the speed.
neutralize in washing soda
remember first water that acid Strong acids are not to be used by
And maybe for all you money saver try to etch you files.
use following Clean the file in a hot washing soda bath with a brush,
or with an other way of decreasing.
Than put them in the following mixtuRe:
7 parts water
3 parts sulphuric acid
1 part Nitric acid.
In a few minutes ready. Neutralize in washing soda again.