Hair, bad brushes, silver nitrate or dichromate oxidizing the metallic part of
it, I have found a solution that works for me since a couple of years:
Holding the brushes by the hair, I plunge the wooden part, the metallic part
and 3 millimeters of the hair part in a 2 components epoxy varnish.
If I accidentally forget the gum-dichromate hardened brush in water for a
week, then it is still usable.
Even my set very expensive soft nylon 2 inches brushes have been receiving
this protection coating and don't blame me anymore for dropping them in my
kalliargyrotype mixture.
Philippe,
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Philippe Moroux
http://www.knoware.nl/users/philippe/
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