What should be avoided to prevent scalp irritation from hair coloring?

Overlapping hair color onto previously dyed hair is the correct choice to avoid scalp irritation during the coloring process. When color is reapplied to previously dyed hair, it can lead to an accumulation of chemicals on the scalp and hair strands. This repeated exposure may increase the likelihood of irritation or even chemical burns, especially if the same area is colored multiple times without proper care.

In contrast, using a color-safe shampoo, applying conditioner before dyeing, and using semi-permanent dyes are practices that can help promote hair health and minimize damage. A color-safe shampoo is less likely to strip the hair of color, while applying conditioner can protect strands from potential damage caused by the dye. Semi-permanent dyes are typically less harsh than permanent dyes, reducing the risk of scalp irritation. Thus, avoiding overlap is crucial to maintain both hair and scalp health.