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Phil,
Do you know the particle size range that the lab's equipment can see? Many spectrometers can only see up to about 5 to 10 microns, and usually report in the up to 1-2 micron range. Hardened steel will flake off and cause ~15 micron (and larger) sized particles -- these would never be detected and reported (depending on the equipment).
Regards,
paul...
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