Plus X 1948 ISO

[SpeedGraphicMan]

I got this old unexposed roll of 35mm Nitrate based Plus-X and a few 4x5 sheets of the same.
I wanted to shoot it (I have shot older emulsions with great results in past).

The label rates the film at a speed of 50 degrees.
I do not know if this is DIN - GOST - BSI - or Weston speed. Anyone have any thought as to what Kodak was using to Label its films back then?
Or what the equivalent ISO would be for Plus X in 1948.

With older films such as this, I generally rate it at 1/4 its original speed and stand develop in Rodinal for about 5 hours.

[Jim Noel]

Weston speed 50. If it is post WWII, as you indicate, it is not Nitrate based film.

[rjmeyer314]

My 1946 Photo Lab Index lists plus-x as American Scheiner (ASA ?) Speed 28 in daylight and 24 in tungsten.

[SpeedGraphicMan]

Thanks folks.
I can only go by what the Kodak label on roll which specifically says Nitrate.
Perhaps the date on the roll was intended as exp date?

[Merg Ross]

Thanks folks.
I can only go by what the Kodak label on roll which specifically says Nitrate.
Perhaps the date on the roll was intended as exp date?

Perhaps the 35mm is Motion Picture Film which Kodak manufactured until 1951 on Nitrate. Kodak ceased Nitrate manufacture of regular 35 mm and Sheet Film around 1938-39.

[SpeedGraphicMan]

Perhaps the 35mm is Motion Picture Film which Kodak manufactured until 1951 on Nitrate. Kodak ceased Nitrate manufacture of regular 35 mm and Sheet Film around 1938-39.

Only the 35mm roll says Nitrate which would explain this

[SpeedGraphicMan]

Was the nitrate film Ortho based?

[StoneNYC]

Was the nitrate film Ortho based?

It was most likely not nitrate, the last nitrate was Verichrome IRRC and the oldest non-pan Verichrome (on nitrate) expired 1947 by 1951 it was Verichrome Pan (non nitrate) and I'm pretty sure most other kodak films had converted to non-nitrate much earlier.

[SpeedGraphicMan]

Uh - Pretty certain its Nitrate.
Label says on side 10-18-1948

[StoneNYC]

Uh - Pretty certain its Nitrate.
Label says on side 10-18-1948

I said very likely not, obviously I was wrong. So that answers the question then!

I also missed the bit about "only the 35mm" so I agree with the other poster that it's possibly movie stock, especially with that label. Anyway I wouldn't know, except it's possibly still shootable, I've shot film from 1947 that was faster than that, so you have a chance at least.