> People have been using dark pieces of photographic film to see eclipses since ever. Fully exposed and developed black and white film is safe, color negative

> People have been using dark pieces of photographic film to see eclipses since ever. Fully exposed and developed black and white film is safe, color negative film, however, is totally unsafe, regardless of how dark it might seem. The film has to contain real silver particles, not color dyes. Beware of monochromatic film that looks black and white but it’s really a color negative film developed using C41 process. It has to be real black and white film. http://www.mreclipse.com/Totality2/TotalityCh11.html#Film http://www.mreclipse.com/Totality2/TotalityCh11.html#Film https://eclipse.gsfc.nasa.gov/SEhelp/safety.html https://eclipse.gsfc.nasa.gov/SEhelp/safety.html