Hi all, I was gifted flowers in this and I cleaned it up to use as a terrarium. I washed it with soapy water and used alcohol swabs and left it aside. Today while setting up I noticed these hard Black spots on the glass and it's on the inside. They are very hard. Can't say I've noticed them before so they may have been there. Cleaned with more alcohol and allowed to properly dry. Does anyone have any thoughts on what it could be? And if safe to transfer my plants in?
Update: they seem embedded in the glass so maybe I just didn't notice them and they were already there
by ddot_tabachan
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