Apply 70% alcohol to the hairstrand for 5-7 minutes to remove which of the following products?

Applying 70% alcohol to a hair strand for 5-7 minutes is particularly effective in removing henna because henna is a natural dye that stains the hair. This staining is deeply embedded in the hair shaft, but alcohol can help to lift some of the product due to its solvent properties. The duration of the application allows the alcohol sufficient time to penetrate and break down the pigments found in henna.

While other products like hair dye, gel, and hair mousse can also be removed with various solutions, they typically require different removal methods. For instance, conventional hair dye often necessitates special color removers or shampoos designed specifically for that purpose. Gel products and hair mousse are generally easier to wash out with regular shampoos or conditioners and may not require the use of alcohol. Therefore, using 70% alcohol is most pertinent and effective for addressing the specific challenges posed by henna.