This section is from the book "Alcohol, Its Production, Properties, Chemistry, And Industrial Applications", by Charles Simmonds. Also available from Amazon: Alcohol: Its Production, Properties, Chemistry, And Industrial Applications.
Ten c.c. of the distillate under examination are placed in a small Nessler tube, and in similar tubes 10 c.c. each of 50 per cent. alcohol containing from 05 c.c. upwards of the 001 per cent. standard aldehyde solution. To each tube is added 1 c.c. of Gayon and Schiff's reagent.
After shaking, the tubes are allowed to stand for thirty minutes, when the violet colours which develop are compared.