Found some 4” (100mm) black ceramic coasters on sale at Michaels:
German compass rose:
Moopsy from ST: Lower Decks:
Blasted away at very high power and speed. Very happy with the crisp engraving.
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Indeed, very crisp!
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Really like the compass one. Maybe because it’s more detailed, it really makes the engraving stand out.
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I like the compass one as well. It looks rich in it’s engraving
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Love the bright creamy white that’s under the black! Great find.
but why O instead of E?
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I didn’t even notice that!
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he said German so I’ll guess the German word for east starts with an O?
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Ja, ganz genau - Norden, Osten, Süden, und Westen. 
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Moopsy! 
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Super elegant look to those!
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So nice!
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I was wondering if it was Spanish, but they’d be N, S, O, E.
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Same in French.
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Nice! I have these as well. Street maps look fantastic.
I will say though I tried an experiment. I did one coaster map engraving with three passes at 270 (I wanted to see the depth), and another with eight passes and a higher LPI (811 or something).
I noticed on the second and third pass that the grey became a lighter color, but after that it didn’t change and it really didn’t seem to engrave that much further down - despite my amping up the power a little.
The tile with three passes is cleaner than the tile with eight.
I also took some blue water-soluble ‘glass paint’ and mixed it in a little water, dabbed it all over, and then wiped the paint off the black parts (actually, I washed it off). It looked pretty cool, though I do like the plain look better.
They make great coasters as is. they look good wet and dry quickly. I’d like to try one sealed in resin, though, just to experiment…
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Great contrast.
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exactly what I was thinking. no need to add color. just looks sharp right out of the glowforge
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