Heating affected the colour of oil across all frying variants. A significant (P 6 0.05) effect of frying temperature and time on the formation of colour components in the oil was observed. Colour
darkening increased with heating time and temperature. With increasing frying time, the L value decreased, while a and b values increased. The highest colour changes were observed in oil used for frying at 180 C after 40 h, while the most stable colour was found in palm oil used for frying at the lowest temperature (150 C)