Ilford HP3 - a photo on Flickriver

Ilford HP3

Box and leaflet of a packet of 25 half plate HP3 flat film, a precursor to HP5+. Obviously from the 1940s or early 1950s, this film was introduced in 1943. HP stands for Hypersensitive Panchromatic. Speed group F / 32 degrees refers to a speed of 125ASA/ISO. HP3 was uprated to 200 in about 1955, so this film predates that moment. Note the box recycling scheme!

Also shown are the datasheets present in the box. Contains recipes and advice on using ID-2, ID-11, ID-13 and a hardening fixer. Perhaps D.44 refers to the date of the printing of the datasheet being 1944? The other (later one) on filter factors would then be 1945. Both were in the box.

Also I read (with interest) that pre-1960s speed ratings were conservative in the extreme and aimed to overexpose by a stop or so as a "safety measure" (since images could still be printed from over exposed negatives, but rarely is it possible to rescue underexposed film. So the speed of 125 should be read as 250 or thereabouts.

(Thanks to www.photomemorabilia.co.uk/Ilford/Chronology.html for some history!)

Taken on: April 29, 2012

Tags:

ilford

hp3

speed

group

hypersensitive

panchromatic

ID-2

ID-11

ID-13

fixer

formula

recipe

recycling

box

filter

factors

D.44

E.45 « less

Sets appears in: • Equipment

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