[hopesplz]

What would stain as translucent on light-coloured fabrics?

[fledarmus]

This is an extremely broad question. What exactly are you trying to ask?

Fabrics show colour because they are reflecting some wavelengths of visible light better than others. White fabrics reflect the entire spectrum well, black fabrics absorb the entire spectrum and don't reflect any light. So a light coloured fabric would be one that reflects the entire spectrum pretty well, but reflects one colour a little better than the others. Now, what are the characteristics of the stain that you would like to apply to this?

[hopesplz]

I got some scattered semi-translucent stains on my bed sheet, is a bit like oil stain, but I don't think I've spilt oil on my bed....what else could they be?

(I shed some black light on that group of stains, and they reflect a dark yellow. Could that be sem*n stains?)