Contrast the mixing of colors through additive and subtractive processes, indicating a specific material or medium in which artists use each process.

Additive color mixing is the creation of a new color by a process that adds one set of wavelengths to another set of wavelengths. ... Additive color mixing is what happens when we combine physical pigments, whereas subtractive color mixing is what happens when we filter out certain wavelengths

artists followed a set of rules to achieve ideal proportion.