Review on 🖤 Higgins Waterproof Black India Ink 1 oz: The Ultimate Ink for Precision and Permanence by Deborah Nystrom

I use this specifically for clear plastics. The last two bottles I bought before this one worked great but suddenly changed. One bottle was small, one ounce, like the one I had just bought; the other was a 32 ounce bottle. Both went bad at the same time. I think it was the hot weather lately. They can no longer be applied and dried as an opaque black, but dry to a mottled grey. The bottle I received today was the same. If Chartpak makes a new batch the stuff might be fine, but until then I can't use it. It may still be good on paper, but I don't use it for that.