It has been a few years since we visited this subject and I thought it might do well to remind folks or inform new comers of yet another danger.
If you are using something like a Dremmel Tool it is essential that you wear some sort of protective dust mask. It is much worse if you are using Semi-Chrome. I got really sick a few years ago doing this without a mask and a Boston Area friend wrote that Semi-Chrome has an ingredient that is not even legal to use in American industry because it is something like a Class Two Carcinogen. Some derivative of Ammonia, I believe. Thanks again Ken!
Tom Sanders
Lansing, Mi USA