[rollei_list] Re: The outdate film
----- Original Message ----- From: "X.TRUONG" <truongthx@xxxxxxx> 
To: <rollei_list@xxxxxxxxxxxxx>
Sent: Wednesday, November 26, 2008 8:33 PM
Subject: [rollei_list] The outdate film



Dear everyone,
Some bulk of outdate film is bidding on ebay, but some of them is outdate before 2000. Have you ever used these film? Although be refrigerated, their 
quality still have a decretion.
Someone like shoot with these film, they said that the negative have special 
and strange effection.
Others notice me to shoot the outdate film by increse the speed of film 
(iso/asa), one or two f stop, depending how old of film.
I had some of Kodak Tmax 400 rolls end on 1999, no refrigerated. The negative is more dark than the new, as when the film is over developed. 

Please give me your idea.
Best regards,
Xuan Truong
As film gets older it tends to become foggy and to lose sensitivity. The fogging is due to several factors, for one thing the chemical processes in the emulsion which make it more sensitive during manufacture never completely stop. There are other factors including fogging by cosmic rays but this latter affects mostly very fast film. Generally the faster the film the shorter its storage life is. Refrigerating slows down the chemical reactions and freezing can stop them almost completely. Fog can be suppressed by using an anti-fogging agent like benzotrizole but moderate fog in a negative has the effect of increasing printing time as long as it is uniform but does not increase contrast even though the film may look overdeveloped because it adds density uniformly at all levels, so an anti-fog agent may not have a lot of effect. Nonetheless some benzotriazole of even just potassium bromide will reduce fog noticably. Usually some increase in exposure is necessary. Perhaps a stop. Contrast may not be affected but you have to experiment. Increasing developing time may cause the fog to incrase faster than the image density so should be avoided for old film. You should make some tests checking for effective film speed and for fog level. Start by shooting at rated speed and perhaps a stop more and developing normally. 
    I would not pay much for far outdated film or paper.

--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx 
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