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rub the scales until they get warm between your hands. If they smell like sulphur then they are bakelite or hard rubber. If they were celluloid, the MEK and Acetone would have definitely reacted with...

additionally, you can melt celluloid in MEK (or acetone) and paint the resultant mixture onto celluloid to build up missing pieces, torn out chunks etc.

Celluloid dents can be easily removed, but...

Not sure where you would get it in Queensland, I got mine from an old job I had where they had a large paint booth. Methyl Ethyl Ketone is MEK, its not great for you by any means, but does work...

Acetone works OK with celluloid, but it does not give a full strength solvent weld. Nor, in my opinion does it disappear cracks as well as other chemicals. I use MEK on celluloid fountain pen repairs...