Question 1

Is this root color kit safe for sensitive scalps or chemically treated hair?

Accepted Answer

The kit can be used on most hair types, but because it contains ammonia and para-phenylenediamine, it may cause irritation on sensitive scalps or on hair previously processed with bleach or relaxers; a 48-hour patch test is strongly recommended.

Question 2

What does para-phenylenediamine (PPD) do in this hair dye, and why is it important?

Accepted Answer

PPD is the primary colorant that penetrates the hair cortex and, when oxidized by the developer, forms large pigment molecules that create a permanent, fade-resistant color; it is essential for achieving the deep, uniform shade but is also a common allergen.

Question 3

How often should the Kit Racines Châtain Foncé R4 be applied, and does it contain any controversial chemicals?

Accepted Answer

For root touch-up, the kit is typically used every 4-6 weeks, or when regrowth becomes visible; it contains ammonia and PPD, which are standard in permanent dyes but can be irritating, so follow the recommended processing time and rinse thoroughly.

Henkel, Schwarzkopf

Kit Racines Châtain Foncé R4

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