Storage Of Large Roll Of "Film"

does anyone have thoughts about the storage life of a roll of silver gelatin film?

it is a gelatin silver nitrate K Bromide Iodide emulsion coated onto a very thin clear polyester base...

//

any ideas on how long it will last...
what the best way to store... perhaps cut it then store?

thanks much for your thoughts

.
No.
But, Welcome Back, From The Middle Of Nowhere !

Ron
.

Freeze, sealed in plastic. Store uncut. Could last for decades if not abused. Let it come up to ambient temperature completely and thoroughly before using.

Dear rc-kb,

It depends........

Firstly : what speed is it ?

What is the quality of the raw materials used?, what is the stability of the polyester substrate ? Who coated it ? how old is it now ? how has it been stored since it was coated.

Also, crucially what is the size and weight of the roll and what is the core made of....?

Firstly, once manufactured photo film does have a finite life and its not linear, typically faster emulsions degrade faster than slow ones.

Storing correctly slows the ageing process it does not stop it.

But a rule of thumb for you, and not for commercial re-sale, if its a standard film 5 years or so stored correctly should be ok and perhaps a further couple of years...

Finally : Cooling the product to 5 to 7.5 degrees is sufficient, I know of know evidence that freezing the product extends the life further.

Simon.

ILFORD Photo / HARMAN technology Limited :

Trust Simon for top-notch results.

Simon R Galley said:

Cooling the product to 5 to 7.5 degrees is sufficient, I know of know evidence that freezing the product extends the life further.

Simon.

ILFORD Photo / HARMAN technology Limited :

Click to expand...

.
Unfortunately, I've used up too much refrigerator space for film.
I had to use the freezer for film storage as well ...

Ron
.

I think that should be ' I know of no evidence' if I new how to edit I would, but I don't, so I have'nt.

But I do apologise for my error..

One thing I did think, all of you who are emulsion chemists and coaters who ( very impressively ) make your own products, or anyone who buys liquid emulsion DO NOT FREEZE these, EVER, or this will result in the total loss of your emulsion.

Simon : ILFORD Photo / HARMAN technology Limited :

it is "enlarger speed" ... this is the first large run made here in Dallas by amateurs... it was coated just a few weeks ago. it has been stored in a large restaurant refrigerator... nothing else in it... NOT frozen.

we have about 20 sheets (about 11 in sq) cut that we plan to use as tests for aging.. our hope is that this roll lasts (for our use) about 3 years... so 5 would be great.

we only want to coat every couple of years....

Simon, thanks very much for your response....

Firstly, very well done for coating it, not easy I bet......in fact I take my hat off to you...

It sounds real slow, that should help, technically 3 years should be fine... very good idea to do sample ageing tests, as its 'home coated' I think the issue you will undoubtedly face is its sensitomometric stability in this period.

Best of luck ...I hope it keeps really well for you.

Simon ILFORD Photo / HARMAN technology Limited :

Simon R Galley said:

One thing I did think, all of you who are emulsion chemists and coaters who ( very impressively ) make your own products, or anyone who buys liquid emulsion DO NOT FREEZE these, EVER, or this will result in the total loss of your emulsion.

Simon : ILFORD Photo / HARMAN technology Limited :

Click to expand...

I froze my first bottle of Liquid Light because I didn't read the instructions. When I was ready to use it, I let it thaw for a couple of days and coated paper with it. The results were great! That said, I now follow instructions and just keep it in the refrigerator. I figure I was lucky the first time and don't want to take any chances.

coating a paper is harder .... we have short runs down, but are still working the machine designs ..
the paper has to be coated a couple times... it is key to success of our revival project...