But why will they not last if they in the end are rinsed properly?
I made big liquid emulsion prints, knowing they usually take longer to fix I used fresh fixer and left them in there for longer. Problem was lack of space, I had to leave them out of the tray for a while, before rinsing them.
This gave them a little change of colour, which I don't mind but is the silver sulphide bad for the picture?
I might try and tone them but afraid the emulsion might get damaged. Maybe I'll try toning the students first and see if they last...