Yellow orange (amber)
yellow + orange
75% Cadmium Yellow + 25% Cadmium Red = #F25212
Keep the red low. A quarter is already enough to swing yellow well past lemon.
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Colour theory
Tertiary colours, with the ratios that actually get you there.
A tertiary colour sits between a primary and the secondary next to it: amber, vermilion, magenta, indigo, teal, chartreuse. The textbook says mix them in equal parts. Real pigments have very different strengths, so equal parts usually overshoots. Each ratio below is the one that lands on the hue.
The six tertiaries
Red orange (vermilion)
red + orange
72% Cadmium Red + 28% Cadmium Yellow = #E93318
Warm red. Use a warm red base, since a crimson base gives you a muddier result.
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Red violet (magenta)
red + violet
70% Alizarin Crimson + 30% Dioxazine Violet = #501226
A cool red carries into violet cleanly. Cadmium red will not, it greys instead.
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Blue violet (indigo)
blue + violet
65% Ultramarine Blue + 35% Dioxazine Violet = #251D60
Ultramarine already leans red, so it needs very little violet to get there.
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Blue green (teal)
blue + green
60% Phthalo Blue + 40% Phthalo Green = #082C3C
Both pigments are very strong. Mix small and add white to judge the hue.
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Yellow green (chartreuse)
yellow + green
82% Cadmium Yellow + 18% Phthalo Green = #66C210
Phthalo green overwhelms yellow fast. Under a fifth keeps it fresh rather than acid.
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Getting them clean
Two tubes, not three. Every extra pigment in a tertiary drags chroma down. If a mix looks muddy, the usual cause is a third tube you did not need.
Bias decides the outcome. Red violet works from a cool red and fails from a warm one. Which tube leans where is covered in the warm and cool colours guide.
Judge in a tint. Strong pigments look near black at full strength. Pull a small amount into white to see the hue before you commit the mix.
Mix any tertiary in your brand
Enter a target colour and Chromilla returns the tubes and parts for your brand and medium.