NIWELATOR CrFe 3
An organic polycarboxylic acid, which complexes iron (III) ions in acidic environments in colourful complexes, which prevents the formation of rainbow coloured smudges on chromate details. Moreover, it doubles or triples the life of a passivation bath containing chromium (III) and nickel and/or cobalt ions.

DYE N-7
A water-diluted blue dye solution, used in chromate passivation with addition of chromium +3. It results in more intensive colouring of zinc layers.