Re: Food colorings in histology
Peggy Wenk and others have noted that tartrazine (Colour Index 19140) is used
both as a histologic counterstain and as a food coloring.
When used as a food coloring tartrazine is called F.D.C. Yellow 5. It is
probably the most widely used of food dyes - look at a bunch of labels on
junk food and you'll see it right down there polywoofsylate, polywopsylate,
and mutilated hydroxypigeondoody. It's actually been the subject of
considerable controversy: a few years ago any guru worth his beard and
sandals would tell you it caused the bratty behavior of whatever normal
little boys are called by school psychologists this week. This tinctorial
fancy seems to have disappeared with Organic Germanium.
To my knowledge no other synthetic dyes double as food colorings and
histologic stains. Unfortunately most of our dyes, in particular the
triarylmethyls (such as fast green, the rosanilines and fuchsins, and a good
many others) are under increasing suspicion as carcinogens and probably won't
be around much longer.
<< Previous Message | Next Message >>