this post was submitted on 04 Oct 2025
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You could buy some acrylic markers and try baking the vessel with the new marks for an hour at 375 F.
You might want to work your way up to the temp over a few hours to prevent shattering.
Also, you could put the glass on a sheet and cover with a mixing bowl up keep the heat more consistent.
I say 375 due to temperature discrepancies in ovens and temperature swings.
The glass could still break, but if you are throwing it away anyway, what does it matter?
Either type of glass used for these should be fine in the oven up to 450°