WHof,

Lots of information re: paraformaldehyde and acetone out there, you just have to dig through the lousy pure silver forums.

http://www.freelists.org/post/pure-s...h-developers,2

http://www.freelists.org/post/pure-s...h-developers,5

etc...

Paraformaldehyde seems to work so well, I don't see the point in substituting it.