They used the 30 grit to cut deep and try to remove it. That didn't work so it's time for the poultice. Try hydrogen peroxide (from a beauty store) or Iron Out to pull it out.
Hi John,
A company I have done work with is the one working on the Terrazzo floor. They asked for my advice. They have stripped the floor and I had suggested the poultice but I wanted to make sure that I had given them the correct advice. Not sure why they used 30 grit. Thanks for your help.
Tony
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