I want to know the answer to the following question:
What root did Egyptians use to source their red pigment alizarin?
All the background I'm provided with is that "The Egyptians used the root of the rubia, or madder plant, to make a dye, later known as alizarin, and also used it to color white power to use as a pigment, which became known as madder lake, alizarin or alizarin crimson.". Is that enough to answer the question?
Answer: yes