Olive 9 1/2 1 is a type of pastel color which is exclusively used in colorants. The advantage of using the color in colorants is that in the hair color, the amount of pigments is controlled, and when used on decolorized hair, does not cause darkness in colorants even if there is a long pause during the operation.

The oxidant used for the color on decolorized hairs is the 3% oxidant.