uni.kn color Petrol.
Petrol provides the preferred color of pal_petrol 
(as an atomic HEX character value) and is defined as 
pal_petrol[[4]].
Petrol
An object of class character of length 1.
pal_petrol for the corresponding color palette; 
pal_unikn for the unikn default color palette with all 5 colors of pal_seeblau; 
pal_unikn_pref for a uni.kn color palette with all preferred colors; 
seecol to show color palettes;
usecol to use color palettes.
Petrol # HEX character "#077187" (as value) all.equal(Petrol, pal_petrol[[4]]) # TRUE (same HEX values) seecol(Petrol) # view color and details
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