Why do grits have dark spots in them ?Next >>
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.
- why do grits have dark particals in them?
- what are the black spots in grits ?