It is formulated to deliver intense black color and a smooth application. The ColorStay Liquid Liner typically comes in a pen-like format with a thin brush applicator, allowing for precise control and fine lines. The formula is usually quick-drying and smudge-proof, ensuring that the liner stays in place throughout the day or night. The shade "Blackest Black" indicates that it offers a deep and intense black color, providing maximum impact and definition to the eyes. To use the Revlon ColorStay Liquid Liner, you would typically start from the inner corner of the eye and draw a thin line along the upper lash line, gradually thickening it towards the outer corner.