Film reel on table aged

An aged film reel on a table recalls the analog era of cinema and photography, with spools of acetate or nitrate that shaped the audiovisual industry.

About this subject

Film reels, also known as spools or rolls, were the physical medium that stored moving images and photographs for much of the 20th century. Initially made of cellulose nitrate, a highly flammable material, these reels required extreme care in projection booths and archives. Historical accidents, such as the Cleveland cinema fire in 1929, led to the gradual adoption of cellulose acetate, known as "safety film," starting in the 1950s.

Each reel held hundreds or thousands of frames, and projection relied on mechanical projectors running at 24 frames per second. Formats varied: from narrow 8 mm and Super 8 used by amateurs and in education, to wide 35 mm (professional standard) and 70 mm for epic productions. The transition to digital cinema, consolidated in the 2010s, made reels obsolete, though filmmakers like Quentin Tarantino and Christopher Nolan still advocate for their use due to aesthetic preferences.

Today, vintage film reels have historical and collectible value. Museums and film archives work on digital preservation, but the chemical degradation of nitrate (which releases nitric acid and can self-ignite) and the fragility of acetate require special storage conditions with controlled temperature and humidity. In photography, film reels are still used by analog enthusiasts, who appreciate the grain, exposure latitude, and developing process.

Frequently Asked Questions

Why were nitrate film reels so dangerous?

Cellulose nitrate is a chemically unstable and highly flammable material. At high temperatures, it can spontaneously combust and burn rapidly, releasing toxic gases. This caused devastating fires in cinemas and archives.

How are vintage film reels preserved today?

The ideal storage conditions are temperatures between 10°C and 15°C and relative humidity of 30% to 50%. Digitization is also common to ensure access to the content without handling the original.

What is the difference between nitrate and acetate film?

Nitrate film (used until the 1950s) is flammable and degrades by releasing nitric acid, potentially self-destructing. Acetate film is more stable, deemed "safety film," but over time suffers from "vinegar syndrome," releasing acetic acid and shrinking.