What is the ideal temperature for a perm solution when applied to hair?

The ideal temperature for a perm solution when applied to hair is room temperature. This temperature is crucial because perm solutions contain chemicals that work effectively at a stable temperature to penetrate the hair shaft and alter its structure. If the solution is too cold, it may not activate properly, leading to inadequate processing and potentially unsatisfactory results. Conversely, if it is too hot, there is a risk of damaging the hair or causing irritation to the scalp. Thus, maintaining a room temperature allows for an optimal balance, ensuring that the perm solution can function as intended while being safe for the client's hair and skin.