One was subjected to 1.5 hrs. of very close-range long wavelength UV with 1/2 the area exposed to UV and the other half covererd.
We found no fading occured in this time frame.
Below is a swatch of three various commerical dyes with the water-based polyurethane binder on bristol paper:
Water-based polyurethane emulsion is more expensive than the acrylics , but the former is bio-degradable.
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