Optical Coherence Tomography to Evaluate the Effects of Oxidative Hair Dye on the Fiber

The study evaluated the effects of oxidative hair dyes on Caucasian hair using breaking strength, color, and optical coherence tomography (OCT) analysis. The hair samples included untreated and treated dark brown and light blond hair with light brown and light blond dyes. Results showed no significant differences in breaking strength between treatments. However, color and brightness varied depending on the dye formulation and hair type. OCT images revealed clear medulla and cortex structures in untreated hair, which were not as distinct after dye treatment. The study concluded that oxidative hair dyes significantly altered the color and ultrastructure of hair.