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Etching old files

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