Dear all!

I use Foma photo liquid emulsion on hanmade paper and something new happened:

The picture looks fine in the developer, but after i place it into the fixer (it usually gets a little darker), but these times it turns to greyish, especially the white parts and the brushstrokes also get visible.
I tried different brushes, but dont find out what could be the problem.
Or if it is either the brush, or the fixer or maybe the emulsion?

Please let me know if you have any idea i could use.
Thanks a lot,