Quote Originally Posted by Ian Grant View Post
Strange Steve, I thought it came from specially grown Irish Orange, Green & Violet potatoes
Yes, you're right. Orange, green and violet. I'm sure it would work withe red and blue though.

As for growing pre-coloured potatoes for their starch, This reminds me of something I read about Fender (the guitar company) injecting trees with dye while they were still growing to get some interesting wood colours.