Quote Originally Posted by Photo Engineer View Post
I must have missed this somewhere in the thread, but surfactants can be easily replaced / exchanged with other surfactants in my experience. There are probably thousands of them on the market.

PE
The substance concerned, according to internet sources, is perfluorooctane sulfonate (PFOS). Why would this particular chemical be so important for the production of Neopan 400 in 120 format?