What is the proper technique Jakub should follow when creating lash fans?

When creating lash fans, dipping 0.5 mm of the base into the glue is the proper technique because it allows for optimal adhesion while maintaining the integrity and flexibility of the lash fan. This amount of glue ensures that enough adhesive is applied to form a strong bond with the natural lashes, while still leaving a portion of the base free from excess glue that could weigh down the fan or lead to clumping.

Using too much adhesive, as suggested in other options, risks creating a heavy attachment that can negatively affect the natural lash's movement and appearance. Additionally, dipping only the tips or the entire length of the base could compromise the fan's structure, leading to poor retention and unnatural aesthetics. Thus, the specified amount of 0.5 mm strikes a balance between adherence and maintaining the fan's shape and lightness, essential qualities for beautiful lash extensions.