Apples are waxy because they produce a natural coating on their skin to prevent water loss and protect against pests, disease, and UV radiation. On top of that, most apples you buy at the grocery store have had an additional layer of food-grade wax applied after harvest to replace what was scrubbed off during commercial washing.
The Natural Wax Apples Grow Themselves
Every apple on the tree is covered in a thin, hydrophobic layer of cuticular wax. This is a survival mechanism shared by most land plants: the waxy cuticle seals in moisture, shields the fruit from ultraviolet light, and creates a physical barrier against fungi and insects. In drought conditions, apple trees produce an even thicker wax layer to prevent water loss and keep the fruit hydrated.
This natural coating is sometimes called “bloom,” the faint, matte haze you can see on a freshly picked apple, especially darker varieties. It contains a compound called ursolic acid, a triterpenoid that has drawn research interest for its potential health benefits. Studies in mice have shown that ursolic acid reduces body mass gain, improves insulin resistance, and lowers blood glucose levels. In humans, it appears to help suppress the accumulation of triglycerides in blood vessels, which may lower cardiovascular risk. This is one reason nutritionists recommend eating apple peels rather than discarding them.
Why Grocery Store Apples Get a Second Coat
After harvest, apples go through a commercial washing and sorting process that strips away most of their natural wax along with dirt and surface residues. The problem is that an unwaxed apple loses moisture quickly, shrivels, and becomes vulnerable to spoilage. Natural wax works well enough on the tree, but it isn’t sufficient for the weeks or months an apple may spend in cold storage, shipping containers, and store shelves before you buy it.
To compensate, packers apply a thin layer of food-grade wax. The process is straightforward: apples are sprayed or dipped in a liquid wax solution, then passed through a drying tunnel where the coating sets. A final polishing step gives them that glossy, uniform shine you see in the produce aisle. The coated apples are inspected for defects and packaged for distribution.
What’s in Commercial Apple Wax
The coatings used on apples typically combine several ingredients. The most common base waxes are carnauba wax (derived from the leaves of a Brazilian palm tree), shellac (a resin secreted by lac insects), and beeswax. These are often blended together, sometimes with wood rosin, emulsifiers, and small amounts of preservatives to adjust the coating’s hardness, melting point, and permeability.
All of these components fall under FDA regulation. They must be either approved food additives, generally recognized as safe (GRAS) substances, or materials with prior sanction for use on produce. When apples are sold in packaging, the label is required to declare that wax has been applied. At the bulk produce display, retailers sometimes post a small sign noting the coating, though this is easy to miss.
How Much Wax Extends Shelf Life
The difference waxing makes is significant. In storage trials, unwaxed apples showed the highest spoilage rates, reaching about 14% rotting under controlled conditions, while apples treated with a 10% wax concentration showed zero rotting under the same conditions. The wax layer physically blocks microorganisms from entering through bruises or small breaks in the skin.
Firmness tells a similar story. Apples naturally soften over time as the pectin in their cell walls breaks down. Over 100 days of storage, unwaxed apples lost roughly half their original firmness. Waxed apples still softened, but those treated at moderate concentrations (5 to 10%) retained noticeably more crunch and scored higher in taste and texture evaluations. In practical terms, waxing is a big part of why you can buy a crisp apple in March that was picked the previous September.
How to Remove Wax at Home
The food-grade wax on apples is safe to eat. But if the texture or idea of it bothers you, it comes off easily. The simplest method is rinsing under warm or hot water while rubbing with your hands or a cloth. Heat softens the wax, and light friction removes it. For a more thorough approach, soak apples in a mixture of one part white vinegar to three parts water for five to ten minutes, then rinse well. A paste of baking soda and a small amount of oil also works as a gentle scrub.
If you want to skip commercial wax entirely, buy apples from farmers’ markets or look for unwaxed organic options. Just keep in mind that without the coating, they’ll dehydrate and soften faster, so plan to eat them within a few days or store them in the refrigerator.