and are now about to dye some calico with this Massachusetts madder, to be exhibited at the ... in Florida, a plant, whose roots, when eaten by hogs, colors their bones red. Such is the effect ...

The root of the madder plant produced a red colour, woad offered blue and yellow was derived from weld. Plants were soaked in hot water and wool was immersed in the dye bath. Stale urine may have ...