Coloured-fleshed potatoes of four varieties were used as raw material for coloured flour and fried snack
production. The effects of thermal processes traditionally used in dried potato processing and in snack
pellet manufacturing on anthocyanin profiles, total polyphenols and antioxidant properties of obtained
half- and ready products were studied. There was a significant influence of potato variety on the experimental
flour and snack properties. Flours with the highest antioxidant activities were obtained from
Salad Blue and Herbie 26 potatoes; however, the flour prepared from the Blue Congo exhibited a much
higher total polyphenol and anthocyanin content. Snacks produced with coloured flour had 2–3 times
higher antioxidant activities, 40% higher contents of polyphenols, attractive colour and better expansion
compared to control samples. The lowest losses of anthocyanins during snack processing were in snacks
with flour from the purple-fleshed Blue Congo and red-fleshed Herbie 26.