Quote Originally Posted by vysk View Post
I thought methylene chloride (found in paint remover) was the proper solvent for balsam and lens cement. That is what I use, last time I did it. I had to soak the doublet for more than a week, at room temp.

Now, if Hasselblad happened to use a more modern UV cured epoxy, then you are stuck (sorry no pun intended). It isn't going to be separated, ever.

http://www.apug.org/forums/archive/i...p/t-71602.html

http://www.optical-cement.com/cement...cementing.html
Methylene chloride is hard to find in "straight" form, although it might be the best solvent. It's also rather toxic - more so than xylene and much more so than acetone.
Acetone and xylene are off-the-shelf hardware items, too. So is toluene, now that I think of it.

Whatever solvent is used, patience is the key. It might take anything from a week to a month or more.