xanthoprotein

from The Century Dictionary.

• noun The characteristic yellow substance formed by the action of hot nitric acid on proteid matters.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Physiol. Chem.) A yellow acid substance formed by the action of hot nitric acid on albuminous or proteid matter. It is changed to a deep orange-yellow color by the addition of ammonia.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A protein formed when xanthoproteic acid contacts epithelial cells, indicative of inadequate safety precautions when handling nitric acid.