Chad | Determining the dyeing of real human hair models

Determining whether rework is needed after dyeing a live hair model hinges on assessing the reversibility of the problem and its impact on subsequent practice. Below are rework decision guidelines for four main categories of issues:

Uneven Coloring: Localized areas without color or patchy shades.

Remediable Situations: Only small areas (e.g., 1-2 strands) are under-colored, and the hair quality is intact.

Slight differences in shade do not affect overall observation and cutting practice.

Solution: Apply the original dye + low-volume hydrogen peroxide (10 vol) only to the uncolored areas and leave it on for 10 minutes for touch-up.

Keep the hair damp during the process to avoid obvious boundaries between old and new color patches.

Rework Required: Large areas of patchy color or overlapping color patches that cannot be concealed by localized touch-ups.

Uneven coloring persists after touch-ups, affecting the judgment of color transition.

Decision Recommendation: If it affects the review and improvement of dyeing techniques, rework is necessary; re-dye the entire hair.