Schiff test is a qualitative test for aldehydes and is performed using Schiff reagent. The sample that needs to be examined is combined with Schiff reagent. If aldehyde is present, characteristic magenta-pink color is obtained. Any compound with an aldehydic -CHO group will show positive Schiff test.  Schiff reagent is prepared by using fuchsin (<1%) dye in water (>98%) combined with sodium bisulfite (<1%) dissolved in solution of hydrochloric acid (<1%).