There have been threads on MG printing of stained negatives IIRC. Since I don't use that method, I have pretty much ignored them. You see, the stain is a dye, and that dye like all dyes, will fade eventually. So a stained negative is a moving target over a certain period of time. IDK if anyone has measured it or quantized it.

But, it is not one of my favorite fields.

PE