Platinum Black Carbon ink in a 60ml glass bottle. A waterproof, pigmented black ink (as opposed to dye-based) that is highly regarded amongst fountain pen enthusiasts and artists.
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This ink is safe for fountain pens, but it does carry some caveats as a waterproof, highly pigmented ink. To prevent clogging, it is best to use this ink in a pen you write with fairly regularly - or flush the pen more often than normal. Do not allow this ink to sit in a pen for extended periods of time.