I still haven't inked any pen with Platinum Chou-kuro (the blackest black ink currently on the market). Joseph gave me a sacrificial Platinum Preppy to use with it,when he gave me the ink, since one needs to use purified or distilled water for cleaning. Will buy some distilled water this week just in case I need to clean Chou-kuro from a pen in the near future. It's that kind of high-maintenance ink.
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