Unique Hydrosil formula for superior, natural looking color. Coppertone Endless Summer Sunless Tanning Tinted Foam is an ultra light sunless tanner that shows where it goes, and dries in only 5 minutes. Superior, natural looking color: Only Coppertone Endless Summer dual chambered products contain Hydrosil, a unique color activator that delivers enhanced color quality. Shows where it goes: A temporary hint of instant color upon application allows you to see where you are applying the foam, so you avoid any missed spots! And Coppertone Endless Summer products with Hydrosil are the first and only sunless tanners that produce visible color in just 30 minutes.