Lancome| Absolue L' Extrait Serum-in-Mask Ultimate À La Rose Each of our Pearl Rose serums in the ultimate mask has been designed using advanced microfluidic bead technology. This technique allows for precise measurement and control of the rarely found rose oil extract concentrations in each sphere. | | Each mask is prepared individually before being applied by mixing beads with our ultimate serum-in-mask base. This preparation ritual is designed so that the properties of each bead are not released until the very last moment.