“In 1898 William Friese-Greene, a professional portrait photographer by trade, demonstrated in London ‘the first process of true natural-color cinematography.’ His program consisted of ‘a series of animated natural-color pictures,’ and although this demonstration aroused considerable interest at the time, Friese-Greene was unable to exploit this system on a profitable basis. Undaunted, he eventually developed a total of four different color methods.”
Frame characteristics / features of margins: Ambrosio. Cf.: Brown, Harold (1990): Physical Characteristics of Early Films as Aids to Identification. Brussels: FIAF, on p. 24.