materials Guava were obtained from the Chuchi farm on the day of test. Skin colour is considered to be the best indicator of harvest maturity in guava fruit . Therefore, fruit having a light green skin colour were hand-picked following commercial practice for long-distance transportation and storage. Fruit were selected for uniformity of size and colour and without blemishes. Upon arrival at the lab-oratory, the fruit were again inspected to ensure that they wereuniform, not damaged, and not attacked by worms. Thirty-eight fruit were randomly chosen for physical and moisture measurements. The remainder were washed, dried naturally, randomly grouped in four carton boxes, and stored in a ripening room at 25◦Cand 70–80% RH, because storage climate is a significant factor influencing the ripening process. After harvest,guavas start ripening at the 5th day and ripeness is well developed during the first 10 days. Impact tests were conducted on the four groups on the 1st, 3rd, 5th, and 7thdays of storage. This gives four different ripeness stages of guava fruit based on fruit firmness, as a result of postharvest ripening instorage