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 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.

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

PO20 is the pigment hiding in your flesh tones, your shadow passages, and your portrait's most convincing warmth - here is what it actually does in oil.

Let's start with the fact that there's actually no such thing as skin color. There is a skin tone.