The medium looks to be an oil paint. The value does not vary in contrast and the color stays on the dark side as opposed to lighter colors/shades
U don't That's the answer. Jkjk
True A special case of contrast of hue is contrast of warm and cold colors. The way the human eye works, cold colors appear to be more distant, while warmer colors appear to be closer. This means that it is a good idea to use a warm color for a symbol or menu, and to use the cold colors for backgrounds.
What staff notes I don’t see any reference