Color("candy1.oth", 1) will pick 1st color in Candy1 color list. It will first search uff folder than system folder for the file name

Color("BlueOrange2.pal", 1) will pick 1st color in BlueOrange2.pal palette file. It will first search uff folder than system folder for the file name

E.g. use Set %c -c color("candy.oth", 2) to set plot color to 2nd color of Candy color list.