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Data sheet.
https://www.tetconnect.com/images/stories/virtuemart/documents/YGC003_SDS.pdf
From reading that, I infer, that if you are a fish or if you eat it, it is bad, but otherwise it is fairly harmless.
I've been told by a mechanic that copper slip is highly toxic (carcinogenic?) and is best avoided.
Think I'll stick to just grease.