Which type of disinfectant is not recommended for salon use because of its active ingredients that are poisonous to inhale?

Formalin is not recommended for salon use due to its significant health risks associated with its active ingredients. This compound, which is used as a preservative and disinfectant, releases formaldehyde gas, which can be extremely harmful when inhaled. Exposure to formaldehyde has been linked to respiratory problems, irritation of the eyes and skin, and more severe long-term health risks. Given these dangers, many health and safety regulations discourage or outright ban the use of formalin in environments like salons where inhalation exposure can occur frequently.

On the other hand, while bleach contains chlorine and can be hazardous if not used properly, it is typically used in diluted forms and does not carry the same level of chronic risk through inhalation that formalin does. Quaternary ammonium compounds are designed for safe use in personal care settings with proper ventilation. Isopropyl alcohol, while flammable and potentially irritating in high concentrations, is also generally considered safe when used appropriately. Thus, formalin stands out as the most concerning option in terms of health risks related to inhalation in a salon setting.