 The inside of the vessel was lined with a dark-colored powder, which was scraped off for further testing.Once the archaeologists took this powder to the Hershey Center for Health and Nutrition to be tested, they found trace amounts of theobromine in the powder, a major indicator of cacao.This cacao was dated to sometime between 460 and 480 AD 

Cacao powder was also found in beautifully decorated bowls and jars, known as tecomates, in the city of Puerto Escondido.