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Jan 19, 2022 at 10:28 comment added Chris H I suspect you wouldn't actually want your diffuse cloud too perfect - if you look at smoke rising or inject ink into apparently-still water, the plumes are far more interesting than simple diffuision
Jan 19, 2022 at 10:28 comment added Chris H That's why I was thinking silk-screen. I haven't done it for years (decades) but recall the screen material being plain white, then one single source of pressure would push the dye through the whole pattern simultaneously. The problem would be that an experiment would take a lot of effort. You'd use it in a similar way to needle injection described in the answer but the base image would also replace the needles (then you'd cast the back once everything was dry). Also you could push dye through more than once, as the resin started to stiffen, to modify the effect
Jan 19, 2022 at 6:21 comment added Joachim @ChrisH I think it should have the appearance of a sheet of paper, in whatever form that could come. I think injecting ink character by character (or even dot by dot) will be too much of an effort with what I imagine to be too little gain, as every injection would need to be of the same quantity, and in the same general direction.
Jan 18, 2022 at 14:58 history edited Elmy CC BY-SA 4.0
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Jan 18, 2022 at 13:17 comment added Chris H How important is the material of the sheet? I'm wondering about the sheet itself being a silk-screen, and injecting dye through that into resin on one side
Jan 18, 2022 at 11:18 comment added Joachim Yes, you're right. Another option would be to perforate the sheet, force-inject coloured resin through the hole, and somehow close the gaps. But that might actually cause a whole new series of problems.. I'll have to experiment in any case.
Jan 18, 2022 at 10:34 comment added Elmy @Joachim TBH I have never experimented with dissolving dried ink that way, but you must keep in mind that reality is never as perfect as you imagine. How long does the sheet need to sink down? How much drag will the liquid resin cause over the surface of the sheet? Or will all of the drag be around the edge and the center will be unaffected? Will the ink bleed sideways instead of upwards? I don't think you'll be able to create the desired effect without faking it. Maybe if you could heat only the spots with the letters, you could create an upward current, but I doubt it.
Jan 18, 2022 at 9:58 comment added Joachim Thank you, Elmy! That's a very good idea, but to inject every single letter of a text will likely not give the right effect. I mentioned the acrylate sheet, not only because it must be harder to properly cast a sheet of regular paper in epoxy, but also because most inks will not dry easily on it. I was imagining that if the sheet is put in still liquid epoxy it might very slowly float down and the ink could potentially dissolve ever so slightly in a seemingly upwards direction. Do you think there is an ink that would create that effect? Or simply one that will reactivate in liquid epoxy?
Jan 18, 2022 at 7:02 history answered Elmy CC BY-SA 4.0