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1816 Encycl. Perthensis (ed. 2) VII. 630/2 Thread and cotton, that have received the mordant of sulphate of copper or iron, take in the madder bath a dirty dull violet colour.

1852 T. Antisell Hand-bk. Useful Arts in Putnam's Home Cycl. III. 340/1 If bran be added to the madder bath, the color becomes much lighter, and of an agreeable shade.

1996 D. Cardon in J. Vercauteren et al. Polyphenols 96 60 The technique of mordanting wool in a boiling alum bath then to dye it in a boiling madder-bath was already precisely described in a seventh c. bc recipe.

2002 J. Straeten Toiles De Jouy 5 Depending on the mordants used, a madder bath (made from the root of the madder plant) could produce reds, pinks, purples and lavenders, black and shades of brown.