Yellow in Mustard
What makes mustard yellow?, and how is it that it is so
hard to get out?
I assume you are talking about "regular" hotdog yellow mustard. I
don't know the exact substance that makes it yellow.There appear to be
several. Google search the term: "mustard yellow color" and you will
see a lot of "hits" including several "home remedies" to remove the
stain. An effective, but ignored, remedy is sunlight, or even
fluorescent light. Keep the spot wet if possible and just let it stay
exposed to sunlight or fluroresent light for several days. The dyes in
mustard are not light-stable.
There are two different topics here:
One: yellow mustard plant flowers are yellow because of plant
chemicals "pigments" (carotenoids).
The second: the prepared yellow mustard condiment is yellow from food
coloring additives including Indian saffron, and sometimes other
yellow food coloring and yellow dye agents.
Anthony R. Brach
Missouri Botanical Garden
c/o Harvard University Herbaria
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Update: June 2012