Palygorskite. Image credit Wiki Commons

HeritageDaily reports on the 12 April that –

The recipe and process for preparing Maya Blue, a highly-resistant pigment used for centuries in Mesoamerica, were lost. We know that the ingredients are a plant dye, indigo, and a type of clay known as palygorskite, but scientists do not know how they were ‘cooked’ and combined together. Now, a team of chemists from the University of Valencia and the Polythecnic University of Valencia (Spain) have come up with a new hypothesis about how it was prepared.

Full article here.