Date this HP3
Can someone date this can of HP3 and the original speed? And any developing times for it? I assume it's a 125 version?
I'm looking for original developing times.
I want to treat it with halogen gas, bracket around the original speed and use an original developing time as an experiment.
By fortunate coincidence I dug out some information Ilford sent me a few years ago to answer another question on the forum about HP4. I still have it in front of me.
It tells me that HP3 was introduced in 1941 and it's replacement, HP4, was introduced in 1960.
The speed was 400 ASA (allowing for the fact that speed was calculated a bit differently in those days).
I've got some times for ID-11 and Microphen, but these are for 35mm , not sure if they apply to cine film?
HP3 400 ASA 35 mm:
ID-11 Normal contrast 9 mins. High Contrast 15:00 mins.
Microphen Normal contrast 7 mins. High Contrast 13:00 mins.
The first release 125, then 200 then 400 in HP3 iirc. But that's as much as a I have.
According to http://www.photomemorabilia.co.uk/Il...hronology.html
"Ilford HP3 Roll & 35mm Film first appeared. Initially 125ASA (250ASA post-1960). Around 1952-53 it became 200ASA (post 1960 the 200ASA emulsion was revised to 400ASA but there was no actual speed increase, it was in recognition that with better exposure determination methods at that time, there was no longer need for all film manufacturers to include an exposure safety margin. This 2x speed increase applied to all black&white films of all makes)."
So it would be 250 or 400 I guess in todays terms.
I guess I'll just have to test with those starting times given.. convert them to Xtol perhaps.
I want to do a before and after test of the treatment and evaluate a useable speed.
I also did just find this - http://www.vurt.co.uk/2009/04/02/ilf...ic-found-film/
Last edited by Athiril; 09-16-2011 at 07:55 AM. Click to view previous post history.
I landed some of this film today, dated December 12 1961.
Originally Posted by Athiril
Yet to open to see if it is indeed the full 200ft; will be an interesting exercise if it is spooling-wise!
Would it be best to cut some short rolls and test at 400 and 250?
I've got D76 and Atomal FF developer on hand any suggestions for a starting time?
The cassette loading need not be a problem. I have used a 200' roll of FP4 cine-film with no accidents, though the same method can easily be used with any bulk 135 film.
The most practical arrangement I came up with was to put two small nails in a length of wood, 64" apart, then hook a perforation over one nail and pull to the other nail (right at the end of the wood strip) and hook the film over that too. I then stuck a piece of masking tape from the side of the reel over the perimeter 'edge', to stop the reel unwinding, and cut the film just after the nail. This gave a 36-exp. length of film which was then fixed to the cassette-core, using a piece of tape pre-cut for the job, and rolled up with the loose end of film still being held by the nail to avoid mad spirals of film flapping about. All of this in the dark, obviously.
The main thing is to be organised with the necessary bits and pieces, especially the bits of tape for the spool - and to avoid dropping the film(!). In practice it proceeds very smoothly after the first few rolls and you don't get the annoying piece of exposed film at the end of the roll, like you do with daylight-loaders.
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Athirils HP3 may be early judging from packaging which I don't recall - I was Kodak until 1960.
The easy way to deal with cine even if you have a dark room.
Spool the cine from 1000 or 400 foot core to a small cine/surveillance camera spool.
It is easy to do this in a small changing bag.
You leave the 1000 feet flat in its half can.
The spools will fit a Watson style teardrop daylight loader.
The spools also came with most Fuji and some Agfa bulk 100 foot packages.
One chum managed to drop 1000 foot of cine into a bath tub just like black spaghetti...
Last edited by Xmas; 05-02-2015 at 07:37 AM. Click to view previous post history.
Reason: Added also
I do have a bulk loader - a Watson teardrop style; I'll need to see if I can find another core to wind some onto so I can wind off what I need. Had several cores for many years, but tossed them after not using them for anything, and as is the norm, now I could really use one!
In the mean time, I'll manage with Martin's suggestion for a few starter rolls - have plenty of nails around the place.
HP3 Original Data Sheets
Hi Athiril and Nanette, Hopefully there might be some information of use to you both in the attached files. [Mr. Galley, please let me know if I'm infringing on a copyright by posting original data sheets from old glass plate and film packages!]. I'm also attaching developing formulas from around 1937 collected from a magazine of that era. The pdf files are low res for the sake of quick downloads, but I do have higher resolution scans if you want them to print out.