Using this eyeliner is easy. First, make sure your eyelids are clean and dry. Hold the pen like you would a regular pen and gently draw along your lash line to create your desired look. For a more precise line, take your time and use short, steady strokes. Remember, these products are for export only, so don't try to use them in the domestic market. Keep the eyeliner in a cool, dry place away from direct sunlight. If the pen dries out a bit, you can gently press the tip on a piece of paper to get the liquid flowing again. And always close the cap tightly after use to prevent it from drying out.