Die Prüfung des Farbensinnes beim Eisenbahn- und Marinepersonal. Neue Folge. 1. Lieferung. Tafeln zur Bestimmung der Roth-Grünblindheit
This 1878 German plate book by ophthalmologist Jakob Stilling, held by the Royal College of Physicians of Edinburgh, was published in Cassel for testing colour vision in railway and naval staff. The single page shows rows of flat colour swatches in reds, greens, blues, yellows and browns, arranged in numbered pairs and triplets, offering a designer a clear reference for how adjacent hues read and how close tones can be confused.
