Great black ink but takes a while to dry
As someone trying to be 100% eco-friendly with their packaging, this was an excellent option for a stamp with my company logo. Although I know there is the option to have items pre-printed with a logo in algae ink, I opted for a stamp and made my own as I figured out what would work best (before having it pre-printed). My only issue is that the ink can take slightly longer to dry on the cardboard boxes. Other than that, it is dark, opaque, and black -- all I was looking for but in an eco-friendly option. Easy to clean, too! The last thing is that the bottle, once empty and rinsed, can be returned for use again. (directions are in the packaging).