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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. Anyone care to share their favorite permanent ink additive - mix of permanent ink + X ink ? While I enjoy Platinum Classics, Sailor nano pigs and Noodler's, it would be great to add a touch of permanence to the rest of my inks. I'm guessing Platinum Carbon Black would be a good stable additive but that was only one test run So far: Success: Platinum Carbon Black (just a smidge) + Noodler's 54th Massachusetts - stableFailure: R&K Salix + Maruzen Blue: the mix writes but precipitates all along the inner demonstrator barrel Ideal: Permanent reveal at 07:15 shows color washout but line is still visible. So the mix would be like this true Platinum Classic: color shows but when water is applied, at least the "permanent" iron gall burn still shows for archival review. https://youtu.be/kcWfuu05Dig Other mixes found: https://www.fountainpennetwork.com/forum/topic/293552-mixing-permanent-inks-with-inks-which-are-not/https://www.fountainpennetwork.com/forum/topic/135497-mixing-inks-sailor-nano/page-3

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