Degradation of anthocyanins could be influenced by Maillard reactions, typical for thermal processing of carbohydrate products. The rate of degradation could vary for products from red or purple potatoes. Therefore, it is interesting to investigate how frying of chips from red and purple fleshed potatoes influences stability of phenolics, especially anthocyanins, and antioxidant activity of ready products. Another question of concern is which pigments (red or purple) are more stable in potato chips and feature higher antioxidant activity after frying.