Colors as digits

Electronic resistors are marked with colored bands, one color per digit: black 0, brown 1, red 2, orange 3, yellow 4, green 5, blue 6, violet 7, grey 8 and white 9. Puzzle caches borrow the code for coordinates, sometimes with painted stripes or colored beads.

Tap the colors in order to get the digits. With three or four bands, CacheCrack also works out the resistance, since the last band is the multiplier. You can also type digits or color names to draw the bands.