Why do grits have dark spots in them ?

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2 Answers
Anonymous

Are you sure they are not tiny bugs?

Expert Answers Expert Answers

Grits are found with black spots, as low temperature-matured vitreous bond materials, the organic materials that are supposed to be completely burned out in fact leave a residue of carbon. This residue collects in surface pores on the grits, which are typically white or colorless, such that the wheel produced may have black spots.

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