Which characteristic is associated with Quats?

Quaternary ammonium compounds, commonly referred to as Quats, are well-known for their antimicrobial properties. This means they are effective in killing or inhibiting the growth of bacteria, viruses, and fungi, making them valuable in various cleaning and disinfecting products. Their ability to function as effective antimicrobials is why they are frequently used in salons and spas for maintaining hygiene and ensuring the safety of tools and surfaces.

While some characteristics mentioned in the other choices could relate to other types of compounds, they do not accurately describe Quats. For instance, Quats are not classified as highly volatile; they generally have low volatility. They also do not primarily act as preservatives or colorants; instead, some may have preservative qualities due to their antimicrobial action, but that is not their defining characteristic. Therefore, the association of Quats with antimicrobial properties is what reinforces their importance in the cosmetology field.