I think your main concern is sanitation/free from organisms (a concern since it comes from india)
There is a bleached dewaxed powdered shellac that is derived by percipitation. There is powdered shellac produced by dissolving the raw material in industrial alcohol (nearly 100%)and filtered. Then there are the flakes which are produced by the alcohol method.
The fact that the shellac is refined using alcohol, then put in alcohol solution by the end user makes me think that it would be germ free. I personally have no qualms about handling the stuff. It fells pretty natural.
I do not carry the two powdered kinds mentioned above, but can get it. mininum order of 50 to 100 lbs.
I do carry the flakes. You would probably want to use the super blonde as it is the clearest and the most filtered.