Depends how big a piece you want, Argos have black sheets from £8.00, how much is Dylan these days, if you have to use three may be cheaper to just buy a sheet.
Gardening on the wild, windy west side of Dartmoor.
The cotton fibres will take the Dylon, but the polyester won't, so you end up with a lighter, patchy version of the colour. You can get dye for polyester (iDyePoly) but you have to boil it, so you'd need a very big pot for a sheet. Probably easier to buy a length of black fabric, or a new black flat sheet.
Edit: Dunelm's website has black polycotton sheets, £5.50 for a single or £7.70 for a double. You'd pay something like that for the dye.
Doncaster, South Yorkshire. Soil type: sandy, well-drained
Not quite what you were asking- at least as far as the emulsion paint is concerned - but @Fire has a thread on dyes/paints for fabrics which may give you an idea or 2. Bit more complicated I know but worth a look perhaps.
I don't think emulsion paint would work, for the reasons given. But you could try a small amount of cloth and paint and see what happens. The question is really what happens when plastic meets plastic (type thing), a bit like finding the right type of glue to bind two types of material.
It sounds like it might want large amounts of cloth for plant shading or similar. And maybe painting it would take too long. Finding some spray paint might work (depending on the project) if you can find one designed for plastics / synthetic fabrics. But maybe the project would require too much spray or it would be expensive.
You can dye polyester and poly cotton mixes but you need the right dye and the right temps. More in the link below.
when we ever have a nice warm day, I think I'll set up a paste table and "paint" it with a roller and hang it on the clothes line ( not used it in 10 years )
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