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LOL. You talked me into it. I'm just hoping that I don't wreck my first batch of scales, hence the post.
On problem with adding grinding dust is it isn't all metal. A large part is abrasive materials. Additionally, the metal is not HTed, so it will oxidize on contact with air and acidic moisture ... like hands. This may tend to stain the users hand.
Another issue is particle size. The powders used in resin casting are much finer.
Many metallic powders are available for adding to resins. These are sold by the resin casting companies like Inlace.
http://inlaceonline.com/text/products/metallic-dusts.html
One could make it up, perhaps those stainless kitchen scouring pads & epoxy resin.
Maybe steel wool,,, steel wool layered with cloth fabric, dryer lint, etc. etc..
The ideas are endless...
Btw, grinder swarf contains abrasive as mentioned, Its metallic content is also burnt & oxidised by the extreme heat of friction.
Not saying that would be a bad thing. At any rate an interesting ingredient
I'm thinking just use some type of glitter... according to the huge amount of it all over my daughter's room it can look like almost any size and colour of metalflake. I'm gonna try it out and call it "hookers floor" pattern