Here comes back the famous slide film from Kodak.

The Ektachrome E100 is a warm low speed slide film with ultra fine grain (T-grain), giving brighter white and high contrast.

Recommended for portrait as there's a great fidelity in skin tones but also ideal for landscape or street photography.

The Kodak Ektachrome 100D is a classic color slide film with unique cinema colors and ultra fine grain.

Manufactured for 16mm movie cameras, it should be developed with E6 process. 

It can be used at 100 ISO (Daylight) or 25 ISO (Tungsten with 80A filter)