Chocolate bloom safe to eat despite white coating, says Hershey

A white or grayish layer that sometimes appears on opened chocolate bars is a natural occurrence called “chocolate bloom.” The bloom can be caused by fat crystals (fat bloom) when cocoa butter migrates to the surface after exposure to high temperatures or frequent temperature changes, or by sugar crystals (sugar bloom) when moisture contacts the chocolate and later evaporates. Hershey notes that the phenomenon does not make the chocolate unsafe; the product remains edible, although its appearance, texture, and gloss may be altered. Consumers should still check for off‑odors, molds, or damaged packaging, as those indicate spoilage. The article explains how to distinguish bloom from true spoilage and why the coating can sometimes be advantageous for certain chocolate processing methods.