E-6 is the reversal process for color slide (transparency) film such as Fujichrome and Ektachrome. It requires dedicated chemistry and tight temperature control, so fewer labs offer it than C-41.2 labs
9-24 Takadachō, Yamatokoriyama, Nara 639-1132, Japan
16-13 Sanjōhinokimachi, Nara 630-8124, Japan