does purple cauliflower stay purple after cooking?

purple and orange cauliflower

Laura and I had never seen purple cauliflower before our trip to Berkeley Bowl on Thursday. According to All About Cauliflower, "This variety of cauliflower has a purple colored curd rather than white as on regular cauliflower. It cooks faster than white cauliflower and has a little milder taste. When cooked, its color changes from purple to green. Purple cauliflower can be substituted for white in most recipes."

Not in our experience though: