I assume you have found the "Anleitung", ie. instructions on
Fischer's site, just underneath the product description. I haven't
tried, but copy-pasting from the pdf-file into an online translator
like Babelfish might give you some help. Here is a first summary:
Preparation is, as usual, good cleaning and degreasing.
The liquid works with silver, copper, brass, tombak (red brass)
and nickel silver.
For silver it says to dip 5 to 10 secs until a slightly blue, matt
surfaces shows. If not sufficient, move another 3 to 5 secs in the
Finish with a fine brass brush to gain an even appearance. It says
that the piece, immediately after the bath, is uneven and not good
Unsuccessful coloration can be removed with a strong sodium
cyanide solution (200 - 500 g/l).
The product is alkaline and corrosive. Wear gaunt, protection
glasses and protective clothing.
Feel free to contact me off-list for further translation /
Best from France,