Resemblance of primer residues to benign particles

[afss]

I read in some articles that there are brake pads that shed particles resembled to primer's GSR particles, meaning, containing Lead, Barium and Antimony (PbSbBa).
I would like to get some information about the differences between the two types.
Thank you.

[Bob Shem]

My co-worker, John Giacalone (pronounced Jack A Loney) is well versed in this.  He had presented and researched the whole brake pad thing.  You can call him at the lab 907 269-5740 or email john.giacalone@alaska.gov.

[afss]

Thank you Bob, I e0mailed him the question.