I had a Portrait Shooting with Expired 35mm Film and I’m surprised about this amazing result.
20 years ago our fine art high school manager gave me 10 roles of black and white Forte Pan Films as a Gift, this is one of those films. after borning Digital Cameras, I didn’t shoot on analog Film for long times. this film expired in 2005.
Exposing time for Expired 35mm Film during photography and developing time
before shooting I made so much research about exposing and developing time but I was confused about it because there is so much information on youtube, some photographers telling, they did overexpose during the photography. but I decided to do nothing and just shoot with the correct exposer time which my lightmeter shows me. also during Developing my Film, I did not change anything.
this film that I used was 15 years expired Film maybe for the other films with longer expired time(30-40 years) you might to shoot over or under Exposed
How to minimize expiring time for photography Films
By keeping the films in a fridge you can minimize the expiring time. To make a photographic film, layers of gelatin, some of which are filled with silver halides (a combination of silver and halogen), are coated onto a flexible plastic sheet. Silver halides are the light-sensitive part of photographic film and react to light exposure. Anyway, these coated sheets are dried, cut into smaller pieces, put in boxes, and sold to people like you and me who go and cut the pieces of the film before dipping them in Expose chemicals to light.
Photographic film has an expiration date because – in the case of the black and white film – halides lose their sensitivity over time. Time, heat, humidity, nuclear collapse, even the glow after creation all play a role. Together, they make changes to silver halides, making them less or more unpredictable in light-sensitive. We generally refer to this effect as fog. Color film using paints and masks, which, like Harlequin lasagna with/between layers of silver halide, adds a little more complexity to the composition. Colors decompose very quickly compared to silver halides and sometimes very quickly relative to themselves. This is not a phenomenon that is limited to photography. I hope this information could be useful for you.