No, there are no photosynthetic pigments in Radicchio.

That is a difficult question to answer, since there are several varieties of radicchio and the sized of the head depends on the variety and what the customer wants. I grow radicchio and I don't let my heads get past 4 ounce in weight. My customers want just a little bit of young radicchio.

Giuseppe Radicchio has written:

'L' isola di San Nicola di Tremiti'

Can be eaten either raw or cooked!

Chioggia costs about €3 a kilo in Italy