Information Regarding Self-Tanning Ingredients in Makeup

Regarding your question about using self-Tanning ingredients to darken concealer or foundation, and whether the effect is washable:

Self-tanning ingredients such as Dihydroxyacetone (DHA) and EasyTan™ (Erythrulose) do not inherently have a dark color that would significantly alter the shade of a makeup product like concealer or foundation in the bottle. These ingredients work by reacting with amino acids in the outermost layer of the skin (epidermis) through a process called the Maillard reaction. This reaction causes a temporary darkening of the skin tone, creating a "tan" effect without sun exposure.

Therefore, adding these ingredients to concealer or foundation will not make the makeup itself a very dark color. Instead, the makeup would apply normally, and then the self-tanning ingredients would gradually darken the skin underneath or where the product was applied over the following hours.

The resulting tan on the skin is temporary, lasting typically several days as the skin naturally exfoliates. This effect is not washable with soap and water like regular foundation or makeup. While the makeup layer can be washed off, the skin underneath will remain tanned until the tan fades naturally.

If your goal is to have a makeup product that changes color or becomes significantly darker upon application to match or create a deeper skin tone, you might consider using pigments specifically designed for this purpose, such as Color Changing Pigment - White to Black (Foundation / Make-up). These pigments utilize encapsulation technology to change color when spread on the skin, directly altering the appearance of the makeup itself upon application.