What is a potential risk associated with using aniline derivatives on lashes or brows?

Using aniline derivatives on lashes or brows poses a risk of blindness due to the potential for these substances to cause severe irritation or damage to the eyes. Aniline derivatives are often used in hair dyes and can cause allergic reactions or chemical burns if they come into contact with the sensitive areas around the eyes. If the dye happens to seep into the eye or if there is accidental application, it can lead to serious complications, including irreversible damage to the eye structures that may result in vision loss. This makes the risk of blindness a significant concern when using products that contain these chemicals around such delicate areas.

While allergic reactions can also occur with aniline derivatives, leading to redness or swelling, the more severe risk associated with misuse or mishaps during application is the potential for blindness. Increased curling of lashes or darkening of non-pigmented hairs are not direct risks associated with aniline derivatives, but rather outcomes that are often desired by clients seeking cosmetic enhancements.