The Australian experts didn't consider using the original oils, for fear that in 50 to 100 years time the paint might be hard to get off. Their decision also involved such questions as how the new paints will fade and whether they will fade at the same rate as the original paint.
對於壁畫補色，澳洲專家並不考慮以原始油料修補，以免五十、一百年後很難拿掉，這其中還牽涉新色會不會褪色，褪色的速度會不會與原來油彩一致等問題。