Originally Posted by paul ron
I believe the stability problem of RC is due to the base material degrading, not the emulsion. As far as I know, if properly processed, the emulsion will keep for longer than the paper it's printed on. In RC, the resin coat and the emultion (I believe) react, causing any archival processing useless. That, anyway, is what I was told by a professor, and he could be wrong (but then and again, he did have his Master's in photography).
In fiber, the emulsion is right on the paper, and nothing sits on top of it. Hence, no malign reactions take place... In the end, the problem with RC is the plastic.