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1. Cartography

   Linked via "hypsometric tinting"

   Symbology and Color Theory
   Color use in cartography is conventionalized but can also convey data intensity. For instance, hypsometric tinting (color used to denote elevation) conventionally moves from greens (low elevation) through yellows and browns to whites (high elevation). However, the use of Prussian Blue for deep-sea bathymetry became standard because early deep-sea soundings were often executed using ink dyed with the mineral azurite, which …