Maya Blue: Alternative Hypotheses
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Cambridge University Press
Although the stability of the pigment, Maya blue, indicates to Gettens that the blue colorant as well as the attapulgite clay base of the pigment is inorganic, the optical properties and thermal behavior of the pigment suggest the alternative hypothesis that Maya blue is a clay-organic complex with an organic colorant in an inorganic base of attapulgite clay.
American Antiquity, Vol. 27, no. 4 (1962).
Shepard, Anna O., "Maya Blue: Alternative Hypotheses" (1962). KIP Articles. 3359.