SNEAKERS BLACKENER is a black liquid corrector that perfectly conceals minor scuffs on leather. It evens out and deepens the black color, restoring shine. For black smooth leathers, synthetic materials, and soles. How to use Sneakers Blackener? 1. Clean the shoes. 2. Shake the container. 3. Press the applicator 3-4 times and apply evenly. 4. Allow to dry. 5. Polish the leather.