system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do printers use cyan instead of blue?
gpt
The primary colors of light are red, green, and blue. Pigments though absorb light and reflect portions of the spectrum so their primary colors are cyan, magenta, and yellow. Printers have to use cyan because they aren't printing light, they are printing a substance which absorbs light.