What is a purple potato?

A purple potato is a kind of potato that has purple skin and or flesh (sometimes called blue) with varieties being Purple Peruvian, Davis Purple, Eureka Purple, Fenton Blue, Purple Mountain, Blue Tomcat etc.
They turn purple cause of the plants chemicals.
A purple potato is a kind of potato that has purple skin and or flesh (sometimes called blue) with varieties being Purple Peruvian, Davis Purple, Eureka Purple, Fenton Blue, Purple Mountain, Blue Tomcat etc.