There seems to be lots of film for sale that is out of date. What happens to film as it ages: does it lose contrast, does it lose its sensitivity to light, will it develop fog? Is there a developer that works best with old B&W film. Do c41 black and white films fair better with the aging process than conventional B&W films? Is out of date film worth the savings in cost? What does out of date mean? If a film is a few months past its sell by date how old will the film actually be?I read somewhere that slow speed films freeze better than fast films, Why?What is the ideal temperature to store film? Do negs from old films curl more? All answers appreciated, thanks in advance Bogey.