The Science Behind Apple Wax
Apples develop a natural protective, waxy layer known as a "bloom" while growing, which prevents moisture loss and spoilage. However, this natural wax is removed during the cleaning process after harvest. To maintain freshness and extend shelf life, a thin layer of food-grade wax is applied commercially. This applied coating restores the protective barrier, helps the apple withstand transportation, and provides an appealing shiny appearance.
Is the Wax on Apples Safe to Eat?
The wax coatings used on apples are safe to eat, as confirmed by health and regulatory bodies like the U.S. Food and Drug Administration (FDA). These food-grade waxes are considered generally recognized as safe (GRAS) and are indigestible, passing through the human body without being absorbed.
What is Food-Grade Wax Made Of?
Food-grade waxes on apples typically come from natural sources or approved synthetic components. Common examples include:
- Carnauba Wax: Derived from Brazilian palm trees, it provides a high-gloss finish.
- Shellac: A resin from lac bugs, also used for a shiny finish (note its animal origin for vegans).
- Beeswax: A natural wax from bees.
- Paraffin Wax: Highly purified and FDA-approved petroleum-derived wax.
These waxes have a long history of safe use in the food industry and are approved globally.
Natural Wax vs. Commercial Coatings
| Feature | Natural Apple Wax | Commercial Applied Wax | 
|---|---|---|
| Source | Produced naturally by the apple's skin during growth. | Derived from natural sources (carnauba, shellac) or synthesized, then applied post-harvest. | 
| Function | Protects the fruit from dehydration, fungi, and insect damage while on the tree. | Replaces the natural wax lost during washing; extends shelf life by retaining moisture. | 
| Appearance | Appears as a dull or powdery "bloom" on the surface of unwashed apples. | Gives the fruit a glossy, polished, and shiny finish. | 
| Application | Develops naturally on the apple's skin. | Applied via sprays or brushes in a very thin layer during the packing process. | 
| Safety | Harmless and fully edible. | Deemed safe for human consumption by regulatory bodies like the FDA. | 
How to Properly Wash Apples
Despite the safety of the wax, washing apples is essential to remove dirt, bacteria, and potential pesticide residues. Washing can also help remove some of the wax, which some people prefer for texture.
Effective washing methods include:
- Running Water Scrub: Use cool running water and a clean vegetable brush or cloth to scrub the surface.
- Baking Soda Soak: Soak apples for about 15 minutes in lukewarm water with 1-2 teaspoons of baking soda, then scrub and rinse thoroughly. Baking soda may help remove pesticide residues.
- Vinegar Soak: Soak apples briefly in a solution of three parts water to one part white vinegar, then scrub and rinse well to avoid an acidic taste.
Always dry apples after washing to further reduce surface bacteria.
Concerns and Considerations
- Pesticide Residue: While washing helps, some worry wax traps pesticides. Proper cleaning is key for all produce.
- Vegan Suitability: Shellac is insect-derived, so vegans may prefer unwaxed or organic apples or inquire about the wax type.
- Taste/Texture: Rarely, excessive wax can cause a slight off-flavor or texture, but this is uncommon with modern application methods.
- Nutrient Loss: Peeling removes wax but also beneficial fiber and vitamins in the skin. Washing is preferred for retaining nutrients.
Conclusion
In conclusion, the food-grade wax on apples is safe to eat. It is a standard, approved practice that replaces the apple's natural protective layer removed during cleaning, thus preserving quality and extending shelf life. Waxes like carnauba and shellac are indigestible and pass through the body harmlessly. While the wax is safe, always wash your apples thoroughly to remove surface contaminants. Washing ensures you can enjoy the nutritious apple skin confidently. The shine on an apple indicates its freshness and safety.
For more detailed information on apple coatings and their safety, refer to the USApple's backgrounder on apples and wax.