Tor-Einar Jarnbjo
Member
Glad my guess seems to have helped.
Yes, thanks a lot for even just suggesting something I might have done wrong and then even being spot on instead of trying to explain to me that I just don't see the stain.
The quality is not the best, but here is a picture of the negative developed in PMK with amidol (upper) and the negative developed in PMK without amidol (lower):