So I sent a sampling of my supplies to be XRF tested by a professional in Michigan
(yay for other etsy sellers helping me with this)
I tested fabrics from Michael Miller, Westminster, Alexander Henry, Robert Kaufman, Windham Fabrics, Premier Prints, a Japanese import, and some vintage prints. Along with some buttons (La Mode and some vintage ones that I have) and Stretchrite Elastic...
All came back fine.
0.00 +- 0.02 levels on everything (so aok!)
(needs to be below .6 now and .3 in August)
Interesting experience.