an obsolete test for tyrosine in which a substance is dissolved in boiling water and quinone is added. If tyrosine is present, a ruby-colored reaction takes place, and the solution turns brown after a few hours.
Wurster,Casimir, German chemist, 1856-1913.
Wurster reagent - filter paper impregnated with tetramethyl-p-phenylenediamine, which turns blue in the presence of ozone or hydrogen peroxide.
Wurster test - for tyrosine.