Yellow/Blue-Top Generating White

Hermann von Helmholtz

Wavelengths of light

Thomas Young

Wavelengths of Spectral Colours

Hermann von Helmholtz

Virtual primary colours

Hermann von Helmholtz

Trois Couleurs Primitives

Claude Boutet

Trois Couleurs Primitives

Claude Boutet

Triplicis uisus, directi, reflexi, & refracti, de quo optica disputat, argumenta

Ibn Alhazen

Triangular prism

René Descartes

Triangular Prism

Giambattista Della Porta

Triangle of Colours

Eugène Delacroix

Three colour printing - Cardinal Fleury

Jacob Christoph Le Blon

Three colour printing