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If you discover an old black and white or color film lying around, your first instinct may be to throw it out. However, it can be used even if it has exceeded the expiration date. All you need to do is determine whether it has already been used (meaning exposed to light) or not. For 35mm film there are generally two key ways to check if the camera film has been used that require a visual inspection. The first method involves looking for the film leader sticking out of the film canister. If there is no film sticking out, then most likely it has been used. If there is film sticking out of the canister, the second method involves checking the film leader for marks, bends, or creases that would be characteristic of film that has been run through a camera. For APS 35mm film, check for the 4 numbers on the top or bottom of the canister. If the number 3 has a white "x" next to it then it has been exposed and ready for development. For 120 or 220 film (medium format) look to see if the word "exposed" is visible. If so, then the film has most likely been used. See below for tips on how to inspect camera film to see if it is used and ready for development. If the film is ready for development, see these articles I wrote about how to develop black and white film or color film at home. Once you have determined the film has not been used, keep reading for tips on how to shoot old or expired film and how to get it developed. How to Tell if a Roll of Film Has Been Used Checking a 35mm film canister to see whether the film has been used or not uses 3 methods that involve a visual inspection of your film without accidentally damaging your film. 1. Look for the Film Leader For canisters of 35mm film to be loaded into the camera correctly, there must be some of the film sticking outside the canister. The portion that sticks out is referred to as the "film leader". When your camera has reached the end of the film roll, you or your camera needs to rewind the film back into the canister so it isn't ruined by exposure to light when changing the film. If you look at the film canister and do not see a film leader sticking out, then there is a good chance that the film has been used. However, this is not a foolproof way to determine whether the film canister has been used. Some cameras may be set to leave the film leader sticking out a little bit after the film has been used all the way. This was common for cameras in the 1980's so film development would be a more straightforward process. See the next step for what to look for if the film leader is sticking out of the camera. Related article: 4 Ways to Get 35mm Film Out of A Film Canister 2. Look for Marks on the Film Leader The way that 35mm film is inserted into a camera can leave clues behind regarding whether it has been used or remains unused. When a film canister is loaded into the camera, the film leader is fed through the take-up spool. As the roll of film is advanced, its perforated edges interact with the teeth in the spool and could leave behind marks. The film also might get marked, creased, or bent by moving through the camera. Perform a quick visual inspection of the film sticking out of the canister. If it has been used you may notice marks, bends, or creases on the exposed film leader. If there are no marks on the leader, then there is a chance the film has not been used. 3. Check the Four Numbers on APS Film If you are shooting with APS film, then you will need to use a different method for checking to see whether the film has been exposed or not. APS stands for “Advanced Photo System.” APS film is unique because the film is put back into the cartridge after being developed for storage. This type of film is less susceptible to damage from dust and other contaminants. To know if APS film has been used, look for the four numbers at the top or bottom of the film canister. If there is a white dot next to “1” , then the film has not yet been exposed. If there is a white half-circle next to “2”, then the film has been changed mid-roll and is ready to be reloaded into the camera. If there is a white "x" next to “3”, the film has been exposed and needs to be developed. If there is a white square next to “4”, the film has been developed and can be taken out of the film canister without ruining it. 4. Look for Arrows in the Small Window on 110 film Cartridge To see the 110 film you have is used or unused, look for arrows in the small window on the film cartridge. If there are arrows present then the film is unused and ready to put into the camera. However, if there are no arrows present in the window but instead showing diagonal black and white lines or black paper then the film is used and ready to be processed. However, there may be a number showing in the small window, this means how many shots have been taken on the roll. All 110 film has 24 exposures so if the film is showing 14 then you have 10 images left to shoot. Another older type of film that is getting more popular is 110 film. Like APS film, 110 film is inside of a specially design case that ensures that the film is placed correctly into the camera and not accidentally exposed. The benefit of 110 film is that is much smaller than other film formats so the cameras where and are much more travel friendly. The downside is that the film is small so the images cannot be enlarged past 4x6 prints or they don't look very good. Related Article: All About 110 Film How to Tell if a Roll of Medium Format (120 or 220) Film is Exposed? If you are trying to determine if a roll of 120 or 220 (generally known as medium format) film has already been exposed to light, look for these signs: The film is tightly wound around the spool The word "exposed" appears on the roll There is handwriting on the roll While there might not be handwriting on the 120 or 220 film roll, if the word "exposed" appears anywhere on the roll then you can be certain it has been used. How to Tell if a Disposable Camera is Used? The film exposure window on top of a disposable camera If you are trying to determine if your disposable camera is used or out of film, first look to see what number is shown in the frame counter window on the top of the camera. Most disposable camera can shoot around 27 exposures (the number is usually written on the camera) and count down to 0 to indicate the camera is out of film. Another thing to know is when the camera is completely out of film and ready to be processed the film advance wheel will spin freely without resistance. Related Article: Cheapest Place To Get My Disposable Camera Developed and How Much Does It Cost? How Long Does Camera Film Last? Film does have expiration dates but old film is considered to be about 10 years are it was manufactured. Most manufacturers designed their rolls of color film to last for two years after purchase. The state of camera film after it has reached its expiration date depends significantly upon where and how it was stored. See this short guide on how to know if film is expired. Refrigerating rolls of film has been shown to increase its lifetime, so if you are lucky enough to find old film that has been stored in a cool and dry place, then there is a good chance that the film will still produce decent images. If the film has been stored in a hot and humid place like an attic, then there is a chance that the film is usable but with problems. Developing it at this point may be challenging, as heat and humidity can cause the film to stick to the inside of the canister. However, read the next section for why and how you would still want to shoot with expired film. Can I Use Expired Film? The short answer is yes. Expired film is actually pretty popular among photographers. If you have film that you are confident has not been used, avoid throwing it out. Photographers like experimenting with old canisters of film. In fact, there is a market of photographers that are interested in buying expired canisters of film that have not been used; this has a lot to do with pricing and availability. Unopened packages of 35mm film, even if expired, can be worth a decent amount of money for this reason. The draw to expired film has to do with, in part, the aura of unpredictability. Some unique visual characteristics are produced when shooting with old film. The grain and color shifts in color film act like a random image filter. The result can be surprising, chaotic, and nostalgic. See below for tips on shooting with expired film. How Do I Shoot with Expired Film? Shooting successfully with expired film requires special care. It is possible to shoot with both color and black and white film and get decent results if you follow the guidelines listed below. According to TheDarkroom.com, as camera film passes its expiration date, it begins to lose its sensitivity to light because the light-sensitive material on the negative (silver halides) become less sensitive to light over time. Since both color and black and white film have this as a layer of material on the negative, both films have this in common. However, with color film the layers of color dyes and color masks that create color will decay overtime causing the film to have less contrast and the colors to shift (usually to red or magenta) when developed. This doesn't mean you shouldn't shoot expired film at all. Just know that you won't get the same results as shooting new film. Below are some tips for shooting with expired film: Change ISO setting (controls the film speed on your camera). The general recommendation is to add 1 more stop of light for every decade the film has expired. See this article about stops of light if you aren't familiar with the term. See this article on how to shoot expired film successfully. If you do not know the true age of the film or how it was stored, you are still encouraged to add at least 1 stop of light. Put old film in an airtight bag (like these bags from Amazon.com) and place it in the freezer. When you take your film out for use, it is important to let it warm up to room temperature before shooting or the film will be ruined. However, this does not apply to instant film, only roll film (like 35mm and medium format) and sheet film. For best results, use the film in bright sunlight as much as you can find. Can I Develop Expired Film? The good news is that you can still develop color or black and white film that is old or expired. Unless it is more than 50 years old or a specific type of slide film, developing old or expired film is just like developing regular film. All you need to do is choose between getting your film developed near you at Walmart, CVS, and Walgreens but will not return your negatives, have low quality scans, or the turnaround time is very long (3 - 4 weeks). For that reason I recommend developing your film using an online company by mail or by yourself at home. See this guide for where to get your film developed online but in my experience, TheDarkroom.com is a great choice for getting film developed by mail since they return your negatives, can handle many sizes of color and black & white film, and can also scan it for you. While The Darkroom.com can develop many types of film they also specialize in antique film and can also develop certain types of slide film, APS, and 110 film. See this article for tips on mailing film for processing and how much it costs. However, if you are more interested in developing film at home on your own, check articles I wrote about how to develop black and white film at home or color film at home. Conclusion If you do happen to find an old roll of film, don't throw it out. If the film hasn't been used, you can take advantage of a burgeoning market of photographers who experiment with expired film or shoot it yourself. Generally, there are three ways to tell whether your film has already been exposed or used. 35mm Film Look for the film leader sticking out of the film canister. If film is sticking out, look for creases or bends in the film. For APS 35mm film, check to see if there is a white "x" next to the number 3 on the cartridge 110 Film Look for the arrows in the small window on the film cartridge to see if the film is unused. Medium Format Film (120 or 220) Look for the word "exposed" on the roll. See if there is any writing on the roll. However, remember these methods may not be foolproof. There are exceptions where the leader may be inside the canister but hasn't been used. For example, it is possible a previous user may have accidentally rolled the leader into the canister and then set the film aside without using it. If this is the case, I recommend purchasing a film leader retriever like this one on amazon.com.