Visible light to the human eye.

Ten colours that always running in the same order. Yellow, green, blue, indigo, purple, violet, magenta, red, orange. The spectrum of colours become a loop.Colours have to transition through each other.

In nature the colours fuse together to make the neutral hues that we see. When condition are perfect, just the right about of raindrops, pure colour is revealed to us.

White light is energy. As the light travels from it's source it gets absorbed and transformed by the space around it. We see this as a gradient from light to dark, but it is a transition through the primary colour.

Colour has to travel up and down like a rainbow ladder.

Important to understand these concepts.

Pure colour has a hue and a value.

There is a point on the value ladder where a colour is not a pure colour. White, black and other hues are added to push the colour up and down the value scale.

You have to commit to your 5 essential values. Hi lite, light, shadow, core shadow and cast shadow and that is it. Reduced to the essential palette.

If you want to replicate nature, use neutral colours or earth colours. Yellow ochre, Burnt Sienna and Burnt Umber. Light, shadow and core shadow. The three essential values can be your default.

If you want things to look 3d select your colour according to the values you need to create the illusion of form. Hi lite, light, shadow, core shadow and cast shadow gives you the complete polished 3d look.