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Etching old files


#1

Hello Marc, File etching goes better in this acid solution It etches
more to the deep. than pure Nitric acid. Works also well on burrs.

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. (remember first water that acid) Neutralise
in washing soda again.

greetings
martin Niemeijer