Maclura tinctoria, commonly known as old fustic or dyer’s mulberry, is a medium to large tree of the Neotropics, from Mexico to Argentina. It produces a yellow dye called fustic primarily known for coloring khaki fabric for U.S. military apparel during World War I.[citation needed] This dye contains the flavonoid morin.[3]

The leaves can be used to feed silk worms.

Old fustic is not to be confused with young fustic (Rhus cotinus) from southern Europe and Asia, which provides a more fugitive colour.

Fustic is a bright yellow dye that is very color-fast when used with mordants. It is frequently combined with other dyestuffs and various mordants to produce a range of yellow and greenish colors:

With woad or indigo: bright or Saxon greens
With bichromate of potash: old gold
With logwood and bichromate of potash: greenish yellows
With copper sulfate: olive greens
With ferrous sulfate: dark greens