A reference chart for potato chip colour for use in India

Fresh and stored potatoes varying in their sugar levels were used to prepare chips of different colours and photographs of these chips have been used to develop a 10 point colour chart with colour scores of 1–10 of increasing dark colour. Chip colour score showed a significant positive correlation (r =0.77**) with reducing sugar content of tubers and the relationship between these two parameters was exponential (R² = 0.75). Use of this reference colour chart will give uniformity in the evaluation of chip colour in India.