Use six letters or digits from 0 to 9 and A to F, like #9B0E00.
Tick the heavy body acrylics you own. Recipes only use these.
The colours you want, from the paints you have.
Michel Eugène Chevreul was a French chemist who contributed to significant developments in science, medicine and art. While working as the director of the dye works at the Gobelins Manufactory in Paris, Chevreul noticed a tendency for a colour to appear to shift toward the complementary of its direct neighbour in both hue and darkness. He called this simultaneous contrast.
Chevreul went on to write extensively about colour in his book "De la Loi du Contraste Simultané Des Couleurs" which then was republished as "The Laws of Contrast of Colour".
Digital colours are mixed using additive light (mixing red, green and blue light makes white). Physical paints use subtractive mixing which means mixing three different pigments will result in a colour heading towards black. Pigments of physical paint absorb some colours of light and scatter others in different amounts.
The app uses the Kubelka-Munk model of absorption and scattering values of pigments and mixes the mapping of the spectral curve of the pigments to reach a target RGB value.
The paints here are spectral data from heavy body acrylic paint. Other paints will mix differently.
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Chevreul is free. Made by Interactive 63, with the code on GitHub.