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Hello I am trying to research permanent and waterproof inks for fountain pens. I am an artist and I am on a quest for the past three years to find the perfect brown to lay OVER watercolor paintings. Not ink first than watercolor. Watercolor first then ink. My goal is to match the hue of the India ink I used in rapidographs Higgins Brown. Yes I know, not to use India ink in fountain pens. Noodler’s Walnut, DeAtramentis Document Brown, Noodlers Black, Platinum Carbon Black are all too dark. I’ve given up and I’m now using Birmingham Pen Co Soft Pretzel because it’s the brown I want - but it’s not lightfast or waterproof. I have to immediately place the finished work in plastic and in a box. Not good to display ever. Questions 1. Will DeAtramentis Dilution ink work to lighten an inks hue? 2. Am I limited to just DeAtrementis Document inks or can I use it on Noodlers, Diamine, Birmingham inks as well? 3. Any advise? samples attached