3M ColorPrint HR 100

3M ColorPrint HR 100 was a private-label film with a complicated bloodline. The emulsion came out of Ferrania's plant in Liguria, the factory 3M had bought in 1964 for $55 million to break into consumer photography. By the 1980s Ferrania was producing private-label color negative for hundreds of brands: Kmart Focal, drugstore house labels, Scotch retail packs, 3M's ColorPrint HR line. The HR stood for High Resolution, which was marketing more than a technical claim.

The color signature carried the Ferrania fingerprint of that era: slightly warm yellows, softer greens than Fuji Superia of the same period, restrained saturation overall. Compared with Kodak Gold 100 it reads less yellow and more neutral. Reviewers at the time noted that 3M prints did not jump off the photo lab rack the way Fuji prints did, which is part of why the line stayed budget-tier even where 3M had real shelf presence.

Grain at ISO 100 was acceptable rather than impressive. The emulsion sat at least a generation behind Kodacolor Gold II or Fuji Reala 100 in fine-grain technology. Latitude was narrow. A stop of overexposure prints flat. Half a stop under loses shadow color noticeably. Press shooters never reached for it; it was a snapshot stock.

3M spun off the films business as Imation in 1996, and Ferrania kept producing private-label color through the late 1990s before the brand collapsed. The ColorPrint HR name disappeared around the spin-off. Expired Ferrania consumer color shifts magenta and builds shadow noise; freezer-kept rolls hold up better.

Formats included 35mm, 126 Instamatic, 110 pocket cartridges, and 120 roll film in the earlier pre-1986 releases. The later Scotch-branded HR 100 reissue from 1987 dropped 110 and 120, keeping only 126 and 135. Process in C-41 at standard times. Rate found stock at 50 to buffer shadows.

The reciprocity exponent is 1.20. Zone Light Meter applies the correction past one second. A metered 10-second exposure becomes about 16 seconds at the negative, and a 30-second reading lands close to a minute. Most HR 100 work was handheld daylight where reciprocity is irrelevant, but the threshold matters for indoor tripod work.