Carmine is commonly used in cosmetics due to its vibrant red pigment.

Advantages:
 It provides vibrant and long-lasting colour, making it an excellent choice for creating bold makeup looks. Additionally, Carmine is derived from natural sources, such as the cochineal insect, making it a preferred option for those seeking natural and sustainable beauty products. Moreover, Carmine is highly versatile and can be used in various cosmetic formulations.

Disadvantages:
Carmine in cosmetics has several drawbacks. Firstly, it is derived from crushed cochineal insects, which raises ethical concerns for those who follow a vegan or cruelty-free lifestyle. Secondly, carmine can cause allergic reactions in some individuals, leading to skin irritation or even more severe allergic responses. Lastly, the vibrant red colour of carmine tends to fade over time, making it less suitable for long-lasting makeup products.

Overall, carmine plays a crucial role in enhancing the aesthetic appeal of cosmetics, although considering its ethical impact and your own ingredient sensitivities is key here.

References:
https://www.britannica.com/technology/carmine
https://pubchem.ncbi.nlm.nih.gov/compound/Carmine