Frontispiece of Chromatography

Chromatography 1835 Frontispiece. Image courtesy of Linda M. Shires 2012. The top image indicates a prismatic fringe visible when a central black spot is observed through Field’s Chromascope, an effect central to Field’s theory that colors are generated by the interaction of light and darkness. The bottom image labels color-values in terms of light, dark, primary, secondary and tertiary.