“…HER (/3-hydroxyethylhydrazine), also known as "Omaflora," is used to induce flowering in pineapples. Thomas and Ackermann (187) have developed a colorimetric method for its determination. After extraction with water and removal of interfering color pigments with ion exchange resins, the HER is reacted with cinnamaldehyde to produce a yellow color which is read at 420 µ.…”