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  1. Any thoughts what could be the concept behind slow evaporating inks, like e.g. Private Reserve Infinity? Some ideas: use > 20% glycerol. Downside: Ink will smudge other humectants sorbitol, urea, LiCl If it is too hygroscopic, the ink will never dry. LiCl will dissolve in its own water. use 2 separate humectants, e.g. glycerol + urea. Not sure why this doesn't smudge patent here: https://patents.google.com/patent/JP4722462B2/en Evaporation suppressing monolayers, e.g. octadecan-1-ol (stearyl alcohol, very common in hair conditioners) will slow down evaporation by about 50%. Ethylene glycol monooctadecyl ether will slow down the evaporation by 10x. These would be ideal, if one could get them through the feed. Downside is they have very low water solubility. Maybe it doesn't matter, as only tiny amounts are required Commercial products for pools are WaterSavr, AquaGuard, CoverFree, which is supposed to reduce evaporation by 85% Could disperse in ink, potentially together with surfactant Use a water-soluble polymer that might concentrate near the surface and act similarly to the monolayer Does PEG have such an effect? PVA, PVP, ... Combination of polymer + surfactant This patent shows a drawing of polyacrylic acid acting together with one of the monolayers above. Other polymers mentioned: soluble polymer may include a homopolymer or copolymer derived from at least one compound selected from the group consisting of acrylic acid, methacrylic acid, acrylamide, N-alkyl acrylamide, glycerol, ethyleneimine, ethylene oxide, vinyl pyrrolidone, vinyl acetate, the hydrolysis products of vinyl acetate, 2-hydroxyethyl acrylate, maleic acid, maleic anhydride and dimethylaminoethylacrylate. Nonionic surfactants might have a good balance between solubility and forming a layer on the surface some compounds to try: Ethoxylates, such as octaethylene glycol monododecyl ether, laureth-4, ... Triton X
  2. From the album: Ink performance testing

    The paper used is Arttec Como Sketch Pad 210gsm paper for mixed media. Platinum Carbon Black ink is waterproof, but if you re-wet the surface of the paper and then apply friction — with your fingertip, a rubber eraser, or even the bristles of a soft brush — some carbon particles can come off and cause apparent smudging. Those loose particles can most likely be washed off completely, however, without staining the page. Originally posted here: https://www.fountainpennetwork.com/forum/topic/355628-struggling-to-find-a-waterproof-black-for-watercolor-sketches/?do=findComment&comment=4357317

    © A Smug Dill

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