Fat bloom

Fat bloom is a common surface defect in chocolate products that appears as a dull, white or grayish film or spots on the surface. It occurs when cocoa butter migrates to the surface and recrystallizes in an unstable form, giving the chocolate an unappealing look. Although fat bloom does not make chocolate unsafe to eat, it significantly affects appearance, texture, and consumer perception of quality.

The main causes of fat bloom include improper tempering, temperature fluctuations during storage and transport, incompatible fat blends, and migration of fats from fillings into the chocolate shell. Preventing this defect requires careful attention to tempering parameters, stable storage conditions between 15–18°C, and proper formulation of fillings and coatings. Understanding the difference between fat bloom and sugar bloom — another common chocolate defect caused by moisture — is essential for effective quality control.

Learn more about fat bloom — including causes, prevention methods, and troubleshooting tips — in the articles below.