Black and white photo negatives, film canisters, and two printed photographs are displayed on a lightbox, showcasing various urban and landscape scenes.

A film lab in London has announced a limited edition black-and-white reversal film named Euston 400. It is Aperture Printing‘s first branded film.

Kosmo Foto reports that the film is a modified version of Rollei’s black-and-white negative stock, repurposed into a slide film using a new development process developed by one of the lab’s team members.

Aperture Printing is located in central London, not far from Euston Road, and analog photographers wanting to purchase the film will need to visit the physical shop on Rathbone Place.

A roll of Euston 400 black and white reversal film, its box, and two strips of developed black and white negatives displayed on a white background.

A close-up of several colorful 35mm film canisters, with one black canister labeled "Euston 400 Black & White Reverse" prominently in focus at the center.

The film is based on Rollei 400 and was developed by Alex Cole, a lab technician who joined Aperture Printing earlier this year. Euston 400 is expected to be the first in a series of black-and-white films designed to be shot as slides and processed using the lab’s proprietary chemistry.

Kosmo Foto notes that black-and-white slide film is not a new concept. Agfa previously released Dia, a 12-ISO slide film, which was eventually replaced by Scala 200X, a more widely adopted film that was discontinued in 2005. More recently, German manufacturer Adox introduced Scala 50, a slide-compatible version of its HR-50 film, in 2019.

Cole says that the project has been something he’s wanted to do for a long time, but developing a reliable and scalable process takes time.

Euston 400 Example Shots

A black and white photo of a gently sloping field with parallel lines in the crops, under a sky with scattered clouds. Five trees are spaced along the horizon.

A smiling older man with windswept gray hair and a beard stands in front of a stone wall, wearing a scarf and denim jacket. The photo is in black and white.

A large tree stands alone in a grassy field with a smaller tree and more trees in the background, under a clear sky. The image is in black and white.

Black and white photo of a multi-story building interior with open walkways and glass walls; a person is visible walking above on a grated floor, casting a shadow below.

A black-and-white photo of a gently sloping field with tractor tire tracks leading into the distance, under a dramatic cloudy sky and a few isolated trees on the horizon.

“Understanding the chemistry and mechanisms of black-and-white reversal has been a personal research project since 2023,” Cole tells Kosmo Foto. “Testing of the process didn’t start until March 2025. Each chemical stage was tested individually to give a whole understanding of the process. Our reversal recipe has successfully developed 50+ black-and-white slide films.”

The lab plans to release two more slide films, also based on Rollei black-and-white emulsions. Aperture Printing has produced just 60 rolls of Euston 400 for this release and it is priced at $10 (£8 per roll). Development services cost $26 (£20), or $34 (£26) which includes scanning.

Aperture Printing doesn’t have an online shop (the “film” section of its website points to in-person ordering) but Cole says on Instagram that he does take postal orders. Additionally, Cole confirms that the film is available in both 35mm ann 120 format.

A full interview with Cole can be read at Kosmo Foto.

Image credits: Aperture Printing