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Title: THIS IS NOT WATERPROOF!
Review: I bought two bottles of this product for ink and watercolor sketching based on the description on this page,and paid to have them delivered overnight for an impending trip. They arrived, and the ink is DEFINITELY not waterproof--certainly not suitable for taking a watercolor wash over the lines. Disappointing, to say the least. I'm told Noodler's Lexington Gray is a good waterproof choice for sketching, but haven't tried it yet.
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