'Someone's mother isn't using Persil yet!', washing powder poster, c 1950s.
© Michael Martin / Science & Society Picture Library
Persil soap powder was first produced in 1909 by Crosfields, a competitor of the Lever Brothers, who merged with them in 1919. The name comes from its original ingredients - perborate and silicate. It remains one of Britain's leading washing powder brands. This image is taken from a slide which was projected in cinemas in the 1950s in the intervals between films.