Wurster reagent

Wur·ster re·a·gent

(vūrst'ĕr),
filter paper impregnated with tetramethyl-p-phenylenediamine, which turns blue in the presence of ozone or hydrogen peroxide.
[C. Wurster]

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.