Line. Nourish. Care. NEW Revlon ColorStay Lash Serum + Liner™ Liquid Liner nourishes your lash line with serum-infused Tahitian Microalgae for visibly healthier lashes in one week. Whether you’re an expert or a beginner—this vegan serum + liner in one has everything you need. It has a flexible brush tip that’s easy to use and control (no dragging or skipping) and it won’t smudge, transfer, fade or bleed. ColorStay Adapti-Flex Color Lock Technology™ delivers bold, rich black color that lasts in just one stroke. All-day wear, waterproof.