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.
3 labs
77 Shimogamo Kamikawarachō, Sakyo Ward, Kyoto, 606-8353 / 606-0812, Japan
1st Floor, Petit Tour 884, 434-2 Ebisuchō, Nakagyō Ward, Kyoto 604-8005, Japan
3-chōme-9-2 Imazato, Nagaokakyo, Kyoto 617-0814, Japan