Now that's a good idea. Why didn't I think of that??
That should be added to the 100 random thoughts thread! I'm sure that pond dye would work great as concentrated as that stuff is.
BIG difference between lake dyes and "spray indicator" colorants.
Both will absolutely work for the goal of marking spray-depositions. However, the difference between the two types of colorants usually becomes very noticable when it's time to clean up - both the spray-equipment AND yourself.
Lake dyes are formulated for longevity (photo-stability), while "colorants" are intended for temporary visual purposes, and generally degrade rapidly in direct sunlight.
