The model has 96 wonderfully detailed and individual human figures and four oxen, all made from clay by by Rakkal Chunder Pal of Krishnanagar, near Calcutta. Production of indigo dye was a major ...

Maya blue is made of indigo embedded in a special clay mineral called palygorskite. A team led by Antonio Doménech at the University of Valencia (Spain) has now discovered that some Mayan yellow ...