Kuro Pan is based on Fujifilm 4771, designated "HC Panchro Polyester" — a high-contrast panchromatic motion picture film produced by Fujifilm in Japan. When Fujifilm ceased all motion picture film production on 31 March 2013, the 4771 went with it. No replacement exists.

The 4771 was built for the most demanding work in the cinema production chain. Its primary applications were travelling mattes — the optical compositing technique used to create special effects in films from the original Star Wars trilogy through the end of the pre-digital era — and title cards, the high-contrast text you see in opening credits. Our specific roll was used for exactly this: a Hollywood film transfer house ran it for titling motion pictures.

The emulsion's resolving power is estimated at 200–250+ lines/mm, exceeding Kodak Technical Pan (125 lp/mm) and approaching the theoretical limits of the silver gelatin process. Grain is virtually invisible — finer than any modern 100-speed film. These properties are not incidental; they are engineering requirements. The film was designed for an optical printing chain where every generation of duplication compounds grain and resolution loss.

Developer choice determines the character of the image. In high-energy developers (D-97, D-19), the film reaches maximum gamma (~3.6) rapidly — steep, graphic, near-binary contrast. In compensating developers (Pyrocat-HD, dilute Rodinal), the same emulsion delivers continuous-tone pictorial results with extraordinary sharpness and smooth gradation. Two fundamentally different looks from one stock.

The film is coated on a polyester (PET) base — archivally stable, dimensionally flat, tear-resistant, immune to vinegar syndrome. It will outlast every acetate negative in your collection.

We acquired our stock — a single sealed 2000ft roll — from a seller whose building had housed the transfer business. Every roll we produce comes from the same coating run (emulsion 738-01, lot 501-08). When they're gone, they're gone.