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Fotospeed RA50 Rinse Aid is a highly concentrated liquid designed to greatly reduce surface tension to allow the easy dispersion of water from the surface of photographic materials without damaging the emulsion.
Used in the final rinse, it noticeably promotes streak free drying of film and shortens drying times
RA50 should be added to the final rinse in the ratio of 1 part RA50 to 200 parts water. i.e. 5mls /ltr of water
Similar to Kodak Photo Flo or Ilford Ilfotol Wetting Agent
RA50 concentrate will keep for several years in sealed bottles