I have seen advertised a product called Opticon which is supposed
to seal fractures.
Hi Herb, I use Opticon all the time and love it. I work with Lake
Superior agates, fractures are the rule rather than the exeption. I
have to say, Opticon seems to do the trick, though I wonder sometimes
what it will look like 10 years from now. Im sure it would work for
you too (standard disclaimer-I havent used it on tourmaline)
There are instructions included in the box, a couple things that I
would add: They recomend first washing the stone down with a
solvent (acetone); make sure to let stone sit for a while by
lightbulb so that any solvent in fractures evaporates. I think they
also suggest alcohol, I think that if you go that route use
annhydrouse rather than regular rubbing (Annhydrouse drys up moisture
and evaporates clean, rubbing contains water and evaporates slower)
Also rather than drop stone in hot Opticon, heat stone (lightbulb
again) and then brush Opticon onto fracture. Both these will help
you get good relatively fast penetration. Also, after stone is
treated dont use solvents on it or your fracture will reappear.
While Im here, I might as well ask a question of my own. Could
anyone tell me a good way to make my own charcoal soldering blocks?
Im sure its in the archives somewhere, I just cant find it. You can
answer me offlist at @joe.hanson if you like. Bye, Joe