I remember learning through chromatography experiments, that the colors spread out like they do in the photo, because of the size of their particles.
When the water travels through the paper and ink, it carries the particles with it, and where they stop on the paper, is where the particles became too big to pass through the fibers any longer.
Being this way, you can say that this form of color, is similar to light, in the fact that what it passes through, and how far it can pass through it, is comparable to the idea of glass being transparent.
Some of the colors (visible light) can pass through the paper (glass) due to the size of their particles, however, not all of it can travel through and when the particles are too large, they eventually stop (the reason the color stops, and why it is hard to get a tan through a window)
Just as the color particles are too big to pass through the paper particles, so is the UV light, that cannot pass through glass.
So you can say that the particle size of different colors and how they act in a chromatography experiment, are relatable to light particles (both visual and UV spectrum) and how they interact with glass.
Technically, if the atom is the smallest part of all things, the basic building block, then it is probable that color (in liquids) and color (in light) are caused by the same things. Maybe they are not the same composition, but their particle size and how it interacts with other objects seem to share a common behavior.
I may be completely off, but I'm interested in if color really is in our minds, then the color in liquid and pigments, must somehow be similar to color in light.
I'm going to check my facts and keep researching this for sure.
image from: http://bekean.com/CAPE/Science%208%20Unit%20A/chromatography.htm
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