In this regard, there have been numerous efforts to improve light efficiency of the BLU with different shapes of the microstructures of the LGP, such as etched dots (most widely used shape) (1), (6), micropyramids (2), microprisms
(3), (4), continuous microlenses (5), convex microlens arrays (MLAs) (6), and so on.
Pucker & Pout, a brush-on lip color, contains vitamins A, C and E, features SPF15 protection and contains color pigments and holographic microprisms
that bend and wrap light around the contours of the wearer's lips.
The alternative strip uses glass beads instead of the microprisms
and is less efficient.