Final answer:
Overlapping hair color on previously tinted hair can create a visible line of demarcation, which is distinct from natural hair texture, highlights, or ombre effects.
The hair coloring process involves complex chemical reactions with an oxidant and coupling agents to achieve the desired color, while minimizing such demarcation lines.
The Correct Option is; b) Demarcation.
Step-by-step explanation:
Overlapping hair color on previously tinted hair can cause breakage and create a visible line of demarcation. This line of demarcation indicates a distinct difference between the newly colored hair and the previously colored strands.
Often, this can result in an undesirable appearance, as the line creates a clear distinction between the two hair colors, and can be quite noticeable.
Hair coloring involves using chemicals like permanent hair color compounds which generally include an oxidant and a coupling agent to achieve the desired hair color. The right blend and application of these components ensure even hair color without causing excessive damage to the hair.
In contrast, semi-permanent color gradually washes out and is less likely to result in such demarcation as it fades.
Care should be taken during hair coloring to avoid overlapping as much as possible, especially with permanent and semi-permanent dyes, to maintain hair health and a uniform appearance.