We are bringing back the altered insulator display into rotation within the hobby. I have been tasked with the process of managing and updating that. Watch for more additions and educational information coming in the next year. At the moment a great reference is

https://www.nia.org/altered

The handouts I had by the display went quickly. You can see their contents at the above web page.

You can see all this beautiful shades of blues and purples and other colors can be made.