Previous page Next page Previous page Next page How long can it last? Libeauty lash & brow tint kit can last up to 4 weeks. Everyone's skin is different and lasts differently. Why is the tube seal sealed and how do I open it? To ensure the quality of the product, the nozzle is closed, you only need to cut it. Is this black eyelash dye friendly for sensitive skin? Yes, we use mild ingredients, but it is recommended to do a test patch behind the ear or on the wrist 24 hours before use. Why does this black color squeeze out brown, and does this affect the desired black effect? It's a normal phenomenon. Due to its vegan formula, it will turn brown after oxidation. Don't worry, the final effect is black.