I was reminded the other day that hidden away in my attic there was a Rockland Colloid Tintype kit that has been sitting there for I guess almost ten years.
Does anyone know how long this stuff is supposed to keep. The package has only been opened to check what's inside, no inner packages have been broken or opened. Can I expect it to work as described, or should I assume that the sensitivity of the material has changed somehow (I would guess decreased) ?
Thanks in advance