Purple shampoo is primarily used to neutralize brassy or yellow tones in blonde or gray hair. It contains purple pigments that help counteract the unwanted warm tones. While purple shampoo may have some cleansing properties, it is not formulated or intended to kill lice.

To effectively eradicate lice, it is recommended to use products specifically designed for that purpose, such as over-the-counter lice treatments or prescription medications. These products typically contain active ingredients like pyrethrin or permethrin, which are proven to kill lice and their eggs.

It's important to follow the instructions provided with lice treatment products carefully and consult with a healthcare professional if you have any concerns or questions about lice infestations.