Getting slightly off-topic, if you have been filling your car with petrol (as we call it over here) on a warm still day (which we don't often get over here!) you will have inhaled large amounts of benzenes in vapour form. If you are a smoker, smoked for a long time (more than 10 years), or live / work in the company of smokers you get the chemicals. These are equally as hazardous as asbestos but because they generate revenue for the state, for some reason they aren't considered as dangerous as asbestos. The quantity which may or may not be present in Chinese talc is minimal (<5% I am lead to believe), and is not added; it is present as a natural impurity, as it is in many cheap talcs from other countries. Have a good day :-)
Maybe makeup brushes they pick up powder (that is what they are designed to do)and maybe they can be washed and dried and used again to pick up more powder, talc or what ever. https://www.google.com/search?q=tal...hes&imgdii=_
I can't explain why...I'm not the scientific type, but I had a similar issue with stamps kept in a baggie in which powder had been added. My wife suggested adding those little drying packets put into boxed electronics, pill bottles etc. It did help, once all the moisture was removed, the powder seemed easy to blow off and was gone. At least from the naked eye. It may still be there to some degree if you looked under a microscope, but it seemed to do the trick. I also save all those packets I get and keep them around my albums to help keep them dry.
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