Senna-yellow to brownish color in water layer. Rhubarb-green to yellowish color in water layer. Cascara-brownish to rose-red color in water layer. Aloes-red in ether and brown in water layer. AMMONIUM MOLYBDATE Aloes and cascara-no color change. Rhubarb-mahogany-brown in water layer. Senna-very light brown to yellowish in water layer. Ammonium sulfate, ammonium persulfate and ammonium oxalate give no color change. URANIUM ACETATE Aloes, cascara and senna-n> color change. Rhubarb-reddish mahogany color in water layer SUMMARY