True story.
Way back when, I shared a house with a young woman, a chemistry grad, who had
worked for a while at (Ciba-Geigy?) the one who had a big facility in
Westchester County, NY, in a town that begins with the letter "A" (I can't
remember, it's NOT Armonk, though). Her job for several months had been to
do a dry run of the test for an FDA submission.
Problem they ran into was, the stuff kept turning yellow, long after
manufacture.
SO, they did the "official" testing with the product delivered as a
yellow pill.....