Does Anyone Know The Ingredients For The Die In Transitional Lenses?

Question

Does Anyone Know The Ingredients For The Die In Transitional Lenses? I have been searching all over the internet for the process involving the making of the die that goes on the lenses and how it is all done. I am doing a Science project and I want to be able to re-create the environment and ability to create them. It does not matter if it is that transitions lens or any other kind that does the same thing... I just really want to find out how its made! thanks!

Answer 1

Borosilicates.