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Working out value charts as Alphonso Dunn's 'Pen & Ink drawing' book suggests. While doing that I thought I'd compare my brown ink, the rich dark brown is Pilot Yama Guri, it is so rich and flows so nicely in my Pilot Namaki Falcon pen, but, it is not waterproof. So I don't use it as often as the others with watercolor. I do love that pen, and that ink is very nice just don't add water unless you're prepared for it to run.