Look at the Irish Eyes seed catalog...they have a blue variety (can't remember the exact name) that keeps it's color. Of course, not everybody is excited about blue mashed potatoes!I am, but my family is NOT impressed! LOL
"Women are angels...and if someone breaks our wings...we fly on our brooms...we're flexible like that!" -Unknown
I order my potatoes from Wood Prairie Farm www.woodprairie.com. They're a certified organic family farm. They have blue seed potatoes -all blue and cairbe. Haven't tried these varieties but the seed potatoes I've recieved from them always have produced great results.