Andrade indicator

Andrade indicator (Andrade) - the indicator is added in the differential diagnosis of carbohydrate environment, used in Microbiology. The basis A. I. is sour foxymonk 0.5 g of acid fuchsin dissolved in 100 ml of sterile distilled water, add 16,4 ml 1 N. of NaOH solution and sterile 5 min. at the temperature of 110 degrees. Keep Andrade indicator in dark bottles. Wednesday after adding A. I. should be colorless or have weak straw yellow colour without pink shade. In the acidic environment A. I. blushes.