Based in Shanghai, Majohn is part of Shanghai Mojiang Trading Co. Ltd. The brand (formerly known as Moonman) is well known for its pens, but they also produce inks. There is a basic black, but they also have a very nice series of ten inks, and possibly more, as well. I expect more from them in the future. You can find them on AliExpress, and other similar sites online.
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Bing Tilian