The term Croconate Blue as a dye name specifically refers to the dipotassium salt K2C14N6O2.
It hydrolyzes slowly in water to give croconic acid violet.
Extended heating in water produces deep green plates, apparently a polymer.
The dipotassium salt is obtained from the acid by treatment with potassium methoxide from water as a green-blue trihydrate, that slowly loses water converting to the dihydrate.
It quickly converts to croconate violet when treated with potassium hydroxide.