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A watercolor paint made from one Colour Index pigment, such as French Ultramarine labeled PB29 alone, as opposed to a convenience mix that combines two or more pigments in one tube. Manufacturers print the pigment codes on the tube label and color chart, which is how to tell the two apart.
Mixing two single-pigment paints puts two pigments in the mix. Mixing two convenience mixes can put four or more, which is a common route to dull, muddy color. Check the codes on the label before buying.