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+1 on the no Santa... I know because the easter bunny told me.

As a geologist/mineralogist I do have a biased list of things to ponder....

Thanks for the images...!

I know there was a lot of research into this back in the 30's
when fine optical...

Can you compare and contrast the material
from the bottom of the vial with the supernatant?

Stokes law will select material by size and
material for you perhaps confusing the conclusions.
...

Very excellent images and data.
It might be interesting to look for and ID
swarf components as well. I fear that
iron and steel in the swarf would oxidize overnight.
But the carbides would not...