nCTION'AltV 01- THE ACriVE I'lilNClrLKS 



Ammonia, pp. sol. in excess. 



[Xot lead acetate.] 



Tannic acid, cloud at 1 in ;!,(100. 



Picric acid, yellow ; at 1 in :!,0(IO amorphous, becoming crystalline. 



[Ferric chloride, after heating till fumes are evolved, gives blue 



coloration.] 

 Platinum chloride, yellow ; becoming gradually crystalline at 1 in 



3,U0ll after I'i hours. 

 [P.illadium chloride, not 1 in 100.] 

 Gold chloride, 1 in r,,(jlllt. 

 Potassium ferrocyanide, sparingly soluble ; pp. = free Narc with free 



HjFcy. 

 [Xot silver potassium cyanide.] 



[Xot potassium chromate cold, but if hot, a pp. of free Xarc. ; concen- 

 trated solutions.] 

 [X^ot ])otassium bichromate, neutral solution.] 

 Potass, bichromate, acid solution, gradual pp. = free Narc. with X.uc. 



bichromate. 

 Phospho-molybdio acid, pp. ; cloud at 1 in 10,000, limit 1 in fiO 000. 

 lodo-potassic iodide, crystalline pp. ' 



Bismuth-potassic iodide, pp. ; cloud if dilute (Dragendorff ). 

 Cadmium-potassic iodide, 1 in 1,000. 

 Zinc-pota.ssic iodide, long hair-like crystals at 1 in 1,(10(1 • feeble at 1 in 



ri,0(X) ; pp. becomes blue. ' 



Mercuric- potassic iodide, pp. ; feeble reaction at 1 in 10.000. 

 [Mercuric chloride, not 1 in 100.] ' 



Iodine tincture, crystalline pp., becoming blue when moistened with 



iodine solution. 

 Colour tests : 



Concentrated sulphuric acid, brown (blood-red or blue if not pure) ■ 



evaporated with dilute sulphuric acid, magnificent red (see Andro- 



medotoxin). 

 Concentrated sulphuric acid with nitric acid, yellow, then orange. 

 Nitre added to the solution in sulphuric acid after 10 hours, the 



yellow solution gives momentary violet-wrose'wcolourless. 

 Xitric acid alone, yellow (with formation of oxalic acid). 

 Hydrochloric acid with h volume water, azure-blue (no colour if liure, 



Anderson). 

 Phosphoric acid (25 per cent.), colourless (see Andi'omedotoxiu). 

 Fnihde's reagent, brown->/>.greeu~>.red'N«.violtt. 



{W) RHEADINE A. (Rhoeadine), C,,H.„XO,; (Hesse): from Papaver 

 rbiuas (Ued Poppy;, and occasionally in Opium ; crystallizes in radiatina 

 prisms ; M.P. I'.'W' (partly sublimable) ; neutral or faintly alkaline taste- 

 less, not poisonous. On treatment with acids or long boi'lin<j with water 

 it gives a reddish-purple coloration even in extremely dilute'solutions. ' 



Soluble in boiling water (Anderson), but scarcely in cold water alcohol 

 chloroform, or benzene ; in 1,280 parts of ether. Acetic acid dissolves 

 with decomposition. 



Precipitants : 



Alkaline hydrates / ,■ , ^, , , , . 

 Ammonia \ ^bghtly soluble in excess. 



Alkaline carbonates, scarcely soluble. 

 Tannic acid, white amorphous. 

 (Platinum chloride, yellow amorphous, soluble.) 

 Gold chloride, yellow flocculent. 

 Potassium iodide, crystalline pp. 

 Mercuric-potassic iodide, pale ) ellow. 

 Mercuric chloride, white. 

 Colour tests : 



See above for general action of acids. 



Concentrated sulphuric acid, olive-green? (red, Dupuy). 



(12) OXYNARCOTINE A., C.,„B..,-NO, (Beckett and Wright) ; minute 

 crystals ; lilackens on heating to 140''-1.")0°. 



Soluble with difficulty in alcohol or water even boiling. Insoluble in 

 ether, chloroform, or benzene. 



On treatment with ferric chloride, it yields Cotarnine and Hemiiiiuic 

 acid. 



{]■.',) GNOSCOPINE A., C;,,H,„N.,0„ (T. and H. Smith); crystallizes in 

 needles; M.P. -2:3:; ; a feeble base. Salts (which are crystalline) have 

 acid reaction. 



Soluble in 1,600 parts cold alcohol, in chloroform and carbon bisul- 

 phide ; with difficulty in benzene or ether. Insoluble in water or amyl 

 alcohol. 



Precipitants : 



Alkaline hydrates, insoluble in excess. 



Ammonia. 



Platinum chloride, pale yellow. 



Mercuric-potassic iodide, white. 



