This concealer is designed to provide coverage for under-eye circles, blemishes, and other imperfections, giving you a more even and flawless complexion. The ColorStay Concealer is formulated to be long-lasting, providing coverage that lasts throughout the day. It is typically available in a range of shades to accommodate different skin tones, and the shade "Deep" indicates that it is specifically formulated for individuals with deeper skin tones. To use the Revlon ColorStay Concealer, you can apply it directly to the areas you wish to conceal or brighten. It can be blended with a makeup brush, sponge, or even your fingertips for a seamless and natural finish. It's often recommended to apply the concealer after your foundation to ensure a smooth and even base.