Which important characteristic should mascara possess?

Mascara is used primarily to enhance the appearance of the eyelashes, making them appear longer, fuller, and darker. One of the most critical characteristics it should possess is that it must be non-irritant to the eyes. The area around the eyes is highly sensitive, and products that are applied in such close proximity should cause no discomfort or adverse reactions. This characteristic is paramount because irritation can lead not only to discomfort but also to more serious issues, such as allergic reactions or infections.

In contrast, while being highly pigmented, containing moisturizers, or being waterproof may be desirable attributes for some users, they do not take precedence over safety. A mascara that irritates the eyes can lead to health concerns, outweighing any beauty benefits it might provide. Thus, non-irritant formulations are essential in ensuring a safe and pleasant experience for the user, making it the most important characteristic of mascara.