Tadbīj is a rhetorical use of colors to convey further meanings by allusion or double significance. Merely naming several colors is insufficient; the listener must be able to follow the customary or figurative connection to the intended sense.
لبست ثياب الموت حمراً ... وهي من سندس خضر
He put on the red garments of death ... which became green silk garments.
The red coloring evokes blood and combat, while green silk evokes the garments of Paradise. The color images thus suggest martyrdom and reward rather than simply describing a change of fabric.