Tint of a colour made by adding white. Shade of a colour made by adding black. If two colours are opposite (on a colour wheel), they are considered complimentary, e.g. red and green. This blog post by Nancy Mitchell discusses complimentary colours in the context of decorating an apartment.
Colour Wheel
Primary colours Red Yellow Blue Subtractive colours (occurs when mixing pigments like paint) based on what is reflected and what is absorbed. Red reflects only red light & absorbs everything else. Cannot be mixed/formed by any other colour combinations. Different primary colour combinations applicable in different ares. Standard computer monitor Continue Reading