The Physics of Color in the Artist’s Hands
An artist choosing a blue is making a decision in physics and chemistry, whether they know it or not. The history of color is a history of science expanding what art could do.
When an artist reaches for a particular blue, they are making a decision in physics and chemistry, even if they would never put it that way. Color is light and matter interacting, and the history of art is partly a history of science handing artists new colors to work with. Every expansion of the palette was a small scientific revolution.
Two kinds of color
There are really two color systems, and confusing them causes endless trouble. The color of light is additive: red, green, and blue light combine toward white, which is how screens work. The color of pigment is subtractive: a pigment looks blue because it absorbs every wavelength except the blue it reflects back, and mixing pigments removes more light, heading toward black. A painter mixes by subtraction; a lighting designer mixes by addition. Same word, opposite physics.
The chase for blue
No color tells the story better than blue, which is rare in usable minerals and was long the most expensive on the palette. For centuries the finest blue, ultramarine, was ground from lapis lazuli mined far away, costlier than gold and reserved for the robes of the most important figures. The artist's access to blue was set by trade routes and chemistry, not taste. When a synthetic ultramarine was finally produced in the nineteenth century, a color once worth a fortune became available to anyone.
New colors from the lab
The lab keeps changing the palette. The artist Yves Klein worked with a chemist to fix the intense ultramarine he trademarked as International Klein Blue, preserving a brilliance that normally dulls when pigment is bound in medium. As recently as 2009, scientists at Oregon State University accidentally discovered a durable new blue, YInMn, while researching electronics, the first new inorganic blue pigment in two centuries. New chemistry, new art, exactly as it has always worked, and a clean case of materials reshaping culture.
Color is in the eye too
Physics and chemistry only get a color to the eye; the brain decides what we actually see, which is why the same pigment can look different in different light and why people genuinely disagree about color, as we explore in how we see color. The artist works at the meeting point of all three, the light, the material, and the mind, which is to say at the meeting point of art and science.