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.