Mega And Fuller Eye Look Libeauty black color kit kept your eyelash & brow black color about 6-8 weeks! The video showcases the product in use. The video guides you through product setup. The video compares multiple products. The video shows the product being unpacked. What is the reason why it does not work after use? 1.Failure to remove other cosmetic residue on eyelashes or brows. 2.Do not take 1:1 equal amount of emulsion to stir into a mixture. 3.The tin ting time is too short. If the effect is not obvious, It is recommended to stay for 2-3 minutes. How many times can I use a kit? A kit can be used 8-10 times. Does this color lotion hurt my eyes? Usually not, but it is important to keep your eyes closed when applying the lash color, preferably with the assistance of a friend.