[Sca-cooks] Mood Indigo

[lilinah at earthlink.net]

A number of Near and Middle Eastern historical recipes call for food 
colored with indigo.

For example, in the Book of the Description of Familiar Food is a 
recipe for spiced salt - Milh Mutayyab. Besides including a fairly 
long list of spices, it can be colored:
Red: Sumac juice
Yellow: Saffron, or water in which thyme has been steeped.
Green: Chard water
Blue: water in which a little indigo has been steeped.

Also, one dish includes as a garnish pistachios colored blue with indigo.

Would a small amount of indigo-colored seasonings or garnishes be safe to eat?

Anahita