Ilford HP3

HP3 was Ilford's fast film through three decades of news photography and press work. Introduced in 1941 as Selo H.P.3 Hypersensitive Panchromatic, it carried 125 ASA on the original boxes, rose to 200 ASA after the 1955 revision, and ended up at 400 ASA in 1960 when the ASA standards body doubled the published speed system without anyone touching the emulsion. Same film, three speed numbers across its life. Ilford discontinued it on December 31, 1969, with HP4 already on the shelves and HP5 only seven years away.

The character was traditional cubic-grain silver work. Larger grain than the later HP4 or HP5, longer toe, a curve that handled press flash gracefully and tolerated under-development from rush-job wedding labs. Microphen could pull HP3 to an honest 650 ASA, which made it the press shooter's choice for available-light news through the 1950s. Compared with Kodak Tri-X of the same era, HP3 leaned softer in the highlights and slightly less aggressive in the grain.

A specialty variant, HP3-M, used a matte surface that took pencil and dye retouching for portrait work. Most studio portraitists in Britain kept boxes of HP3-M for hand-finishing wedding negatives through the 1960s. The standard glossy HP3 came in 35mm, 120, sheet, plates, and the extinct 828 Bantam format.

Developer choice mattered. ID-11 at full strength gave the most predictable tones; Microphen pushed grain and speed; the now-vanished Promicrol from May & Baker was the wedding-trade favorite for shadow detail. Compared with current HP5+, HP3 grain reads coarser and the curve is less linear, but that coarser character is exactly what contemporary photographers chase in surviving rolls.

HP3 has been out of production for over half a century. Freezer-stock rolls and sealed boxes of plates surface occasionally at estate sales. Anything unfrozen since 1969 will show heavy base fog and density loss. Treat surviving stock as a special-occasion film, not a workflow.

Reciprocity exponent is 1.31, the conventional silver-grain baseline. Zone Light Meter applies the correction past one second. A 30-second metered exposure becomes about 90 seconds at the negative, the same math you would use for HP5+ today.