Does burning a coaster using Titanium Dioxide (TiO2) hold up under microscope scrutiny?

I burned a couple coaster as a gift and I used the Titanium Dioxide method where I mix TiO2 with Denatured Alcohol and paint a thin coat onto my tiles. After the burn, I put it under my 1000X microscope to see how well it burned.

Microscpope: https://amzn.to/44EsZP1

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