Polychromie Architecturale (1959) by Le Corbusier. This is not an official version, just something I was messing around with. The colours are accurate, as much as RGB versions of these colours can be.
Here are value scales for the 12 basic hues: tints
Vintage Visuals: ‘Rainbow’, c. 1920 | BrettSpiel | BoardGameGeek
Color Theory Poster to printout for classroom, via Inkfumes, by Seth Wilson.
Once upon an Art Room: Tinting and Shading. Colour Theory
Tint: Any Color mixed with White Shade Any color mixed with Black Intensity: The brightness or dullness of a color
Color of the Day series on Design Sponge. Fascinating history of specific paint pigments.