Using this three - color concealer palette is easy. First, identify the areas with dark circles or tear troughs on your face. Then, select the appropriate color from the palette. For light skin tones, go for 101#; for a more natural look, 102# is a great choice. Apply the concealer gently with a brush or your finger, and blend it well for a smooth finish. Remember to store the concealer in a cool, dry place to maintain its quality. Keep it away from direct sunlight and high temperatures. Also, make sure your hands are clean before using the concealer to avoid contamination. If you have any skin allergies, it's a good idea to do a patch test on a small area of your skin first.