Phil, did you test just ink? |
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I have had the best luck with Swan (brand) "India Ink". My 1962 bottle dried up a while back, and the product seems to have gone missing from stockist shelves. Glass stains and acetate inks simply devour clear plastic, while oil paints, latex and acrylic pigments do not play well with Future (at least not for me). I tried McCormick (brand) food colors in Future, but the color never set, which lead to the experiments with water color pigments.
Grumbacher Academy Artists' Watercolor (brand) with Future works just fine. I've used Payne's Gray, Sepia, Royal Purple and Pthalo Green to make acceptable tints. I'm toying with the idea of using a water colors in a Future base to do a stained glass window for a diorama (just for grins, you unnerstand).
Tamiya (or Gunze Sanyo) transparent paints are the way to go, but sometimes they are not available, or they just do not have the color you want.