Here's why it's not true:
* Regulation and Safety: Cosmetics are regulated by government agencies (like the FDA in the United States) to ensure they are safe for use. Using rat droppings as an ingredient would violate numerous health and safety regulations.
* Ingredients: Mascara is typically made with ingredients like pigments, oils, waxes, and polymers that are specifically chosen and tested for cosmetic use.
* Manufacturing Processes: Modern cosmetic manufacturing involves controlled processes and quality control measures to ensure product safety and consistency.
* Lack of Credible Evidence: There is no credible scientific or factual basis to support the claim that rat droppings are used in mascara.
It's always a good idea to be skeptical of rumors and to rely on trusted sources of information when it comes to product ingredients and safety.