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Traditional Japanese color, made for actually using.
Nakagawa's Kyoto gansai has a richer, more substantial character than conventional transparent watercolor. The color can move from bold and almost gouache-like to soft and washy depending on how much water you introduce, which makes a small box surprisingly open-ended.
This twelve-color set is approachable enough for an afternoon of experimentation and capable enough to keep an experienced painter interested. Put a wet brush to the color and see where it goes.