Example of 9 different colourings of the same Color Proof; we can observe 3 different green tonalities: 

dark green, emerald green, dark olive green (the definitive issued stamp will assume this last colouring); 

the other colors are: 
lilac, blue, loaded red, darkorange, brown violet and brown. 

All the color codes have been imprudently erased by an unprepared collector (or dealer), with the exception of the dark green Proof (green 1313); 

of the others color codes, we can see some only with an accurate examination with direct light: 

dark olive green (green 1315),

blue (blue 1102), 

loaded red (red 1408),

brown violet (violet 1514)