Not only am I interested in past photographic processes, I have an interest in emulating recent photographic processes such as Kodachrome 64. One such style used quite frequently is bronze skin tones. The technique I use is to apply Red Green and Blue values in the Curves option to Highlights, Midtones and Shadows of an image. Initial values are obtained using the Colour Sampler tool and modifying the values to fine tune the result. Other processing may be required to get the exact tone required.