Well, like photoflow - this stuff is a drop or two in the wash tank. It is certainly already on any C41 negs I have. Fuji says their process (it is part of their minilab regiment) is good for 80 years ???? yeh, right. It does leave a nice shine on the negs and resists spots much better than photoflow so .... I'll check myself in the dark from time to time and let you know if I glow. I think minilab operators drink this stuff with orange juice. Thanks for all the insight! - Frank