It sounds like it might be old. Maybe you haven’t had it for a long
time, but the stuff has a shelf life, and it may have reached it.
I don’t use the gel, but the solid stuff, breaking off what I need
and doing my best to wrap it back up airtight. When I see that it
doesn’t disolve well, then I know that it will take a loooooong time
to oxidize silver. It will eventually (give it an hour or two). The
first color you get is a sickly yellow, that goes golden, then on
through the colors. Never quite the dark blue-grey of fresh stuff,
If you haven’t had it long, let Otto Frei know, so they can do
something about the product.