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This is an older review, and my opinion of this ink now is mostly negative, though I will admit that I haven’t traded the bottle and do still use it, but only with fine nibs. It’s an interesting concept and message, but the end result and usability of the ink is very limited.
Oddly enough it’s better behaved on copy paper:
Here’s a drip test:
And a full soak test:
I can’t tell you exactly how long it soaked, but it was probably 10-30 minutes. Washing away the yellow component of the ink really doesn’t take long to do.