Colors and patterns of snakes are reviewed and discussed from several viewpoints: function of color as distinguished from function of pattern; chromatogenesis, normal and abnormal; genetic control over chromatogenesis; normal variation in color and pattern; and abnormal variations in color and pattern.
Bechtel, H. B. (1978). Color and Pattern in Snakes (Reptilia, Serpentes). Journal of Herpetology, 12(4), 521–532. https://doi.org/10.2307/1563357