Annie and Kerik:

I'll bet the reference about gelatin came from here:http://www.mikeware.demon.co.uk/prep.html. Look at the paper paragraph where he talks about gelatin being inimical to pure platinum prints, but okay with palladium. That is one of the reasons he says that Buxton can still be used to make truly 100% platinum prints, since it is sized with alki-something dimer-something.