With summer temperatures rising, the demand for refreshing fruits such as watermelon has surged — and so have concerns over adulteration.
Watermelons, composed of over 90% water, are a popular seasonal fruit packed with essential vitamins A, C, and B6, and antioxidants such as lycopene. The fruit also contains potassium, magnesium, and the amino acid citrulline, which support cardiovascular health and muscle recovery.
However, some sellers may artificially enhance the fruit’s colour or inject chemicals to make them appear more appealing. To help consumers make safe choices, here are 10 tips to select the right watermelon:
1. Check the shape
Choose watermelons that are symmetrical and uniformly shaped. Irregular shapes can indicate uneven ripening or poor growing conditions.
2. Cotton ball test
Cut the watermelon and rub a cotton ball on the flesh. If the cotton turns red, it may signal the use of dyes or chemical injections.
3. Thump test
Tap the watermelon lightly with your knuckles. A ripe one will produce a deep, hollow sound — a sign it’s juicy and ready to eat.
4. Lift and weigh
A heavier watermelon typically contains more water, indicating better juiciness and flavour.
5. Look for sugar spots
Tiny brown freckles or streaks on the skin, known as sugar spots, suggest high sugar content and sweetness.
6. Inspect the bottom
The underside or ‘field spot’ should be creamy yellow, showing the fruit ripened naturally on the vine.
7. Glass tumbler test
Place cut pieces in a glass of water. If colours separate, artificial colouring may have been used.
8. Check rind colour and texture
Opt for watermelons with deep green colour and dark stripes. Avoid pale, bruised, or soft-skinned ones.
9. White paper rub
Rub white paper or tissue on the fruit’s flesh. If colour sticks to the paper, it may contain harmful chemicals.
10. Examine for bite marks
Inspect for external damage or bite marks, which may come from rats or pests in storage facilities.