Three-colour carbon print showing the English actress, Lena Ashwell (1872-1957). The laborious three-colour process was the means of producing high quality colour photographs, prior to the invention of Kodachrome in the 1930s. The subject would be photographed three times in black and white through red, green and blue filters, which were then printed together. Lena Ashwell entered the theatre in 1891, gaining her greatest fame in the years 1896-1925, and managed her own theatre, the Kingsway, between 1907 and 1915.
© National Museum of Science & Media / Science & Society Picture Library