Mandelin reagent

Man·de·lin re·a·gent

(man'dĕ-lin rē-ā-jent),
a solution of ammonium vanadate in sulfuric acid, used in color tests for alkaloids.
References in periodicals archive ?
4] dip; 2C, formaldehyde for 5-10 min, then Mandelin reagent dip.
4] (S4, Marquis reaction); a second plate similarly exposed to formaldehyde was dipped into Mandelin reagent (S5).