Painters often add a small amount of one colour to every mix on the palette: the mother colour. It pulls the colours towards each other, so a painting reads as one light and one moment rather than a collection of separate colours. A warm ochre mother gives late-afternoon warmth; a blue-grey gives an overcast calm.
How much is enough
Less than you’d think, and more doesn’t keep helping. The mother does most of its work in the first fifth; past that you are mostly just dulling every colour by the same amount.
Choosing a mother
- Earth colours (ochre, sienna) make the best mothers: they unify without turning anything green or purple.
- A cool mother, like blue with white, gives overcast, evening or underwater light. It pulls hardest on the warm colours.
- The mother can be your light: mix a little of the colour of the light source into everything it touches.
- Leave one or two accents without the mother. They’ll stand out because everything else agrees.
Palettes from a photo
A reference photo already has a mother colour: the light it was taken in. Pulling a palette from a photo gives you the handful of colours that cover most of the picture, and solving each against real paint gives you a recipe you can actually mix, with a warning when a colour is out of reach of your tubes.
- Use a photo in even light: strong shadows and highlights become colours of their own.
- Judge lights and darks first. A values view of the photo shows the structure before hue distracts you.
- Adding a mother colour to a photo palette tints every colour towards one harmony, the way a painter unifies a scene.