Why Sloan Triangle?
This is based on John Sloan’s Book The Gist of Art. He uses a triangle to show how color mixes harmoniously. among many other things.

Sloan Colour Triangle

Mixing Metaphors

All colour mixed from three primaries. White and black are value modifiers only. Value is the most important quality of colour.

Primaries

Lukas 1862

Cad Red Light

Lukas 1862

Lemon Yellow Primary

Lukas 1862

Ultramarine Blue

Neutrals

W Bk

Presets

Paint-like mixing

85%

Value table

Source Rows

Actions

Value Scale

Each column shows a palette colour across 7 value levels. The ring marks its natural value. The curve shows the palette's tonal range.

natural value · curve = tonal range · row 1 = lightest · row 7 = darkest

Green test — Yellow mixed with Blue

Subtractive mixing should produce a believable green at the midpoint.

Yellow

50/50 —

Blue

Colour Triangle — Sloan

Outer: full intensity (A). Middle: semi-neutral / metaphoric primaries (B). Inner: neutral (C). Based on John Sloan's colour triangle.

A — Full Intensity

B — Semi Neutral

C — Neutral