Relaxers that contain only one component and are used without mixing are

• A. Ammonia-based relaxers
• B. Guanidine relaxers
• C. Metal hydroxide
• D. Ammonia-thiol relaxers

Answer: (C)

The main idea is that some relaxer systems come as a single, ready-to-use formula with no mixing required. Metal hydroxide relaxers fit this description: they contain a metal hydroxide base (such as sodium or potassium hydroxide) in a pre-mixed cream that you apply directly. There’s no need to blend separate parts before use, which is why this category is the one-component, no-mix option.

Because the active ingredient is a strong metal base, these relaxers are highly effective at breaking the hair’s disulfide bonds to straighten, but they’re also more aggressive on the scalp and hair. That’s why precise timing and scalp protection are essential.

The other types typically involve more than one component or require activation by mixing before use, so they aren’t single-component products.