Final answer:
Knowledge of color theory is essential in the hair design procedure, particularly for effective application of hair dye and understanding how different hair colors will react to the dye. Permanent and semi-permanent hair dyes affect the hair differently, and understanding these effects helps tailor the hair design to individual needs.
Step-by-step explanation:
During the hair design procedure, knowledge of color theory is necessary. This knowledge is key to effectively apply hair dye and achieve the desired hair color, while considering the original color and how hair absorbs dyes. Hair coloring is a chemical process that changes hair color for cosmetic reasons such as covering gray hair or changing to a more fashionable look. Permanent hair coloring specifically alters the hair's structure, requiring a three-component system including a diaminobenzene derivative, a coupling agent, and an oxidant. The process, which occurs under basic conditions, results in a long-lasting color change until the hair is cut.
While semi-permanent color washes out after several weeks and offers a more natural look, permanent color changes are more significant. The final color also depends on the individual's original hair color and porosity, leading to variations across the head. This variation can also mean that gray and white hairs may not take on color as effectively, requiring different strategies as graying becomes more pronounced. Choosing the right type of hair dye and application method is critical for achieving the desired results.
Using permanent hair dye, applying hair extensions, or shaving the head completely are not necessary for all hair design procedures and depend on individual goals and conditions. However, a grasp of color theory is fundamental to any coloring process, which allows tailoring hair design to individual preferences and ensuring professional results.