Dark skin is not a dark tube. Four pigments give our skin its color, and every one of them has a tube on my palette.

Burnt sienna and white is not a skin color. I mix the family first, then move the value until the mix sits right on my hand.

Painting a shadow over with darker paint covers all your work. I mix the lit side and the shadow side from one recipe, and I leave shadows light on purpose.

My first layer of skin looks pale and a little dead, and that is fine. Skin is not mixed. It is built, one layer at a time.

Most painters fix a wrong skin tone with another tube. My skin comes from the same five, and each one has a job.

How copper acetoarsenite became the most exciting and most dangerous green on the Victorian palette, and what the modern tube labelled "Emerald Green" actually contains.

What Van Gogh's sunflowers can teach you about a pigment that lies in slow motion.

It disappeared from every palette around 1750, and nobody noticed for almost two centuries - here is what it actually does in oil and why it matters now.

The Renaissance's affordable cobalt blue had one catastrophic secret, and old paintings have been revealing it ever since.

What is actually in the tube, why it dries slowly, and how Rembrandt used bone black to make a robe darker than the shadows behind it.

Every earth red on your palette leans warm. Except one - and that one is the reason a cheek can actually turn away from the light.

Every painting before the 20th century was built on it. Here is what it actually does, why a few painters still use it, and what to watch for if you open that tin.

Skin shadows are not gray. They are red - and this ancient pigment is how painters have known that for 25,000 years.

One tube with the tinting strength of a dye, a history measured in decades not centuries, and three habits that separate the painters who use it from the painters it uses.

Why portrait painters use alizarin crimson in exactly the application where it fades fastest - and what the permanent swap actually means.

PV15 is not a separate mineral - it is ultramarine blue that has been baked until the chemistry flips. Here is what that means for how you mix it.

Most red ochre is opaque. One version is not - and it changes everything about how you glaze warm darks.

Why the most expensive pigment in history still earns its place on your palette, and the three mixes that prove it.

The most powerful yellow on your palette is also the easiest to misuse - here is what it actually does in oil, and the three mixes that make skin glow.

PV23 is the most powerful pigment on the palette - one knife-tip too many and every color you mixed becomes its background.