A comparison of dyeing efficacy between hair‐oxidation‐based and hair‐coating‐based shampoos for the treatment of gray hair

• Published in: Skin research and technology Vol. 29; no. 6; pp. e13383 - n/a
• Main Authors: Jang, You Na, Seok, Joon, Park, A Yeon, Lee, Woo Geon, Lee, Jung Min, Kim, Yu Jin, Kim, Su Young, Yoo, Kwang Ho, Lee, Jung Ok, Kim, Beom Joon
• Format: Journal Article
• Language: English
• Published: England John Wiley & Sons, Inc 01-06-2023
• Subjects: Coating; Coatings; Color; Coloring Agents - analysis; cuticle damage; Damage; dyeing effect; Dyes; Elasticity; Friction resistance; Gloss; Hair; Hair - chemistry; hair health; Hair Preparations - pharmacology; hair‐coating‐based shampoo; hair‐oxidation‐based shampoo; Humans; Hydroxyl radicals; Moisture content; Moisture effects; Moisture resistance; Oxidation; Proteins; Proteins - metabolism; Retention; Shampoos; Softness; Tensile properties; Transmission electron microscopy; Water content; dyeing effect; hair-oxidation-based shampoo; hair health; hair-coating-based shampoo; cuticle damage
• ISSN: 0909-752X; 1600-0846; 1600-0846
• DOI: 10.1111/srt.13383

Background
The process of hair dyeing causes hair damage, and periodic re‐dyeing is required for newly grown hair. To avoid these hassles, hair color shampoos have been developed and are widely used. In this study, we compared the effects of two hair color shampoos with different dyeing principles to analyze the function of hair color shampoos. We analyzed hair tresses treated by hair‐oxidation‐ and hair‐coating‐based shampoos.
Materials and methods
We measured the color, tensile properties, softness, elasticity, gloss, moisture content, and protein content of the hair tresses dyed with color shampoos. The hair structures were analyzed by scanning and transmission electron microscopies (SEM and TEM) and a hydroxy radical‐based method.
Results
The shampoo based on hair coating enhanced the hair dyeing effect and roughness, whereas that based on hair oxidation improved the color retention and moisture content in the hair tresses. Frictional resistance, gloss, and elasticity of the hair tresses were similar for the two products. However, according to the results of the protein loss test, TEM, and hydroxyl radical staining, the shampoo based on hair oxidation showed a longer dyeing retention compared to that based on hair coating but caused cuticle damage.
Conclusion
These results show that the two shampoos with different dyeing principles exhibit different hair dyeing abilities and hair health indices. Therefore, we recommend that hair color shampoos should be used according to the requirements of an individual.