Pamphlet No 20 Camouflage- Disruptive Painting of Vehicles dated June 1939.
top of the page is the

Wrong way to paint,

Bottom of page is the Right way to paint it. The Cammo paint used in this 1939 booklet. G3 basic colour ,now known as Khaki Green. Disruptive Colour G4 Dark Green [ European conditions ] . G5. Light Green for very light backgrounds.