Recently (sorry-I lost the post), someone asked why mustard was such a
good dye. It may be worthwhile to clarify what one means by "mustard".
Mustard (the ground seeds in vinegar and spices-often called "Dijon
style") is basically brown, and while it stains a little, to my
knowledge it's not a terribly good dye. However, American mustard, as
sold in the supermarket, is bright yellow because of the addition of
tumeric. Tumeric is a very good dye (you can use it for Ester eggs, and
even cloth I'm told, though I haven't tried it myself.) It's the
tumeric that leaves yellow stains on your shirt when you get sloppy at a
barbeque. Is this what the original poster meant by "mustard"?