What should be done when applying a relaxer to hair?

When applying a relaxer to hair, it is essential to monitor the processing time closely. This is crucial because relaxers are strong chemical formulations designed to break down the protein structure of the hair to make it straighter. If the relaxer is left on the hair for too long, it can cause irreparable damage, leading to excessive dryness, breakage, or even scalp burns. Therefore, keeping a precise record of the processing time ensures that the treatment is both effective and safe, allowing the stylist to achieve the desired level of straightening without compromising the hair's integrity.

The other options, such as applying to dry hair, using high heat, or using excessive amounts, would not be appropriate practices. Relaxers should be applied to damp hair to allow for even distribution and to minimize potential damage to the scalp. High heat is not typically recommended during the relaxer application since the chemical reaction takes place at room temperature, and excessive heat can exacerbate damage. Similarly, using excessive amounts of product can lead to uneven results and complicate the rinse-out process, increasing the risk of over-processing.