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Showing results for tags 'changing colors'.
I have a Hero 616 pen and a bottle of their ink, not so sure what model since I just picked it up in China because of it's price, which is like a dollar for 15ml. I used it in my 616, which has a sac refilling system, and after the ink flows down into the bottom, the top turned orangish red from the remainder of the ink. Is that what black ink do or what?