If you have spent any time in the film photography world lately, you have probably heard people raving about Kodak Vision3. It is literally the same motion picture film used by Hollywood cinematographers to shoot movies like Once Upon a Time in Hollywood, Dune, and basically anything directed by Christopher Nolan. It is known for its ridiculous dynamic range, beautiful highlight roll-off, and cinematic color shifts.

There is also another massive reason everyone is shooting it right now: it is cheap. If you buy it in bulk and spool it into empty cassettes yourself, a roll of Vision3 500T or 250D costs a fraction of what a roll of Kodak Portra 400 costs today.

But there is a catch, and it is a messy one. It is called remjet. If you try to drop a roll of unadulterated Vision3 off at your local lab, they will either turn you away or charge you a premium to process it by hand. If you try to run it through a standard minilab machine, it will completely ruin their chemistry and coat everyone else's photos in black sludge. Believe me, you do not want to be that person.

The good news? Developing cinema film at home is actually incredibly easy once you understand what you are dealing with. I have washed the remjet off dozens of rolls in my bathroom sink, and I promise you can do it too without ruining your photos or losing your mind.

What Exactly is Remjet?

Remjet stands for "removable jet black." It is the black, carbon-based coating painted onto the base side (the shiny, non-emulsion side) of motion picture film. It serves a few really important purposes for cinema cameras. First, it acts as an anti-halation backing, which stops bright light from bouncing back through the film base and creating glowing halos around light sources. Second, it acts as a lubricant so the film can securely fly through a motion picture camera at 24 frames per second without scratching. Finally, it prevents static electricity buildup, which could cause tiny lightning bolt streaks across your images.

Cinestill film is essentially just Kodak Vision3 that has had the remjet layer chemically removed before being packaged. That is why Cinestill has those famous red, glowing halations around streetlights. Without the remjet, the light bounces back and blooms.

If you want to shoot real Vision3 without paying a premium, you simply need to remove that black layer yourself during the development process.

The Big Debate: ECN-2 vs. C-41 Chemistry

Before you mix your chemicals, you have a choice to make. Motion picture film is natively designed to be developed in ECN-2 chemistry. However, standard color negative film is developed in C-41 chemistry. Can you cross-process Vision3 in C-41?

Absolutely. Most home developers just use standard C-41 kits because they are cheap, easy to find, and last a while. Cross-processing cinema film in C-41 adds a little bit of contrast and grain to the final image, which honestly looks incredible for everyday street and portrait photography. If you want the ultra-flat, true cinematic look with slightly muted contrast that gives you maximum control when scanning, you can buy a dedicated ECN-2 home development kit from a few specialty brands.

For the sake of this guide, the remjet removal process is exactly the same regardless of which developer you choose.

What You Need for the Remjet Pre-Bath

If you buy a dedicated ECN-2 home kit, it usually includes a pre-bath powder specifically designed to soften the remjet. But if you are using your standard C-41 kit, you will need to make your own pre-bath. Do not worry, it is almost practically free.

All you need is baking soda (Sodium Bicarbonate) and washing soda (Sodium Carbonate). You can find washing soda in the laundry aisle of almost any grocery store.

• Mix one tablespoon of baking soda and one tablespoon of washing soda into 1 liter of warm water (around 100 degrees Fahrenheit or 38 degrees Celsius).
• Stir it until everything is dissolved. That is it. You just created your magic remjet-softening potion.

The Remjet Removal Process: Step-by-Step

Load your film into your Paterson tank in the darkroom bag just like you always do. Now, before you add any developer, we have to deal with the remjet.

Step 1: The Pre-bath Soak
Pour your homemade baking/washing soda solution into the tank. Agitate it vigorously for about 30 to 45 seconds. Do not be gentle here; giving the tank some good, hard inversions helps physically break the carbon layer loose inside the reel.

Step 2: The Black Dump
Pour the pre-bath out. You will notice the water comes out looking like pitch-black ink. That is the remjet! Do not worry if it looks like you just ruined your film; this is exactly what is supposed to happen.

Step 3: The Endless Rinse
Now, fill your tank with hot tap water (roughly the same temp as your developer). Agitate hard 10 times, and dump it. Keep filling, shaking, and dumping. The water will slowly go from dark gray, to light gray, to eventually clear. Once the water pours out totally clear—usually after 4 to 6 rinses—you are ready to develop.

Step 4: Develop Usually
Pour in your C-41 or ECN-2 developer, followed by your bleach/fix (or blix), and wash your film just like you normally would. The remjet step is already behind you.

The Critical Final Cleanup Step

Here is where most beginners make a mistake. Even after all that shaking and rinsing, there will still be a thin, slimy layer of black remjet residue clinging to the shiny side of your film. If you just hang it up to dry right now, that residue will dry into crusty black water spots, and it will permanently ruin your scans.

After your final wash, pull the film off the reel. Take a very soft microfiber cloth, a wet makeup sponge, or honestly just the smooth pads of your thumb and index finger. Get the cloth or your fingers wet.

Hold the top of the film strip and gently wipe down the shiny base side of the film under running water. Be very careful not to scratch the dull emulsion side—that side is delicate and holds your actual image! As you wipe the shiny side down, you will see a little bit more black soot come off on your sink or cloth. Do this until the shiny side feels perfectly smooth and squeaky clean.

Run the film through some Photo-Flo (or a tiny drop of dish soap), squeegee the water off, and hang it up to dry. Clean up your sink immediately—remjet easily scrubs off porcelain while it is wet, but it is annoying to clean once it dries.

Why Manual Cameras are Best for Cinema Film

There is just one technical hurdle to keep in mind when shooting Vision3. Because this film is intended for gigantic Panavision movie cameras, the bulk-loaded 35mm cassettes you buy online usually do not have DX codes printed on them. A DX code is the little silver and black barcode on standard film canisters that tells an automatic point-and-shoot camera what ISO to use.

If you put a non-DX coded bulk roll of 500T into a modern, fully automatic point-and-shoot, the camera might default to ISO 100 or simply refuse to shoot at all. Because of this, cinema film is best shot on a manual camera where you can physically dial in your own ISO settings.

If you need a reliable, fully manual setup to start shooting Kodak Vision3, grab a classic setup from the shop. A sturdy, metal body layout gives you full control over metering and exposure, making it the perfect match for experimental stocks. You can check out a great selection of vintage gear right here: 35mm SLR cameras.

Developing cinema film takes a few extra minutes of scrubbing, but pulling a perfectly exposed, incredibly detailed roll of actual motion picture film out of your bathroom sink makes it totally worth the effort. Do not be afraid of the black sludge. Mix up some baking soda, agitate properly, and enjoy the cinematic tones.