Günzberg's test

[güntsbərgz, -bĕrks′]
n.
  1. A test for detecting hydrochloric acid utilizing phloroglucinol and vanillin, which produce a bright red color in the presence of the acid.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.