Plum Safety Inspection

Plums are often treated with purple dyes to look more vibrant and coated with wax to prevent moisture loss and maintain a glossy appearance. 1. The Cotton Rub Test (Dye Detection): Soak a cotton ball in water or liquid paraffin and rub the purple skin of the plum. If the cotton picks up a purple or pink tint, artificial dye has been applied. Natural plum color remains on the skin. 2. The Scrape Test (Wax Detection): Gently scrape the skin with a dull knife. If a white, flaky, or powdery substance comes off, it is an industrial wax coating. 3. The Water Soak (Chemical Check): Soak plums in warm water for 15 minutes. If the water turns purple or develops a chemical, oily film, suspect artificial coloring and heavy fungicide treatment. 4. The Bloom Check: Fresh, natural plums often have a "bloom" (a thin, white, waxy-looking natural coating that rubs off easily with a finger). If the plum is mirror-glossy and lacks this natural bloom, it has likely been washed and treated with industrial wax.