J. C. BlaJce — Colors of Allotropic Silver. 287 



Table I (continued). 

 B. Ammoniacal Solution of Silver Nitrate. 



Eeagents. 



Opaque 

 precipitate, 

 color in re- 

 flected light. 



Solutions, color in transmitted light. 



Blue. 



Eed, 

 dilute. 



I Red, con- 

 'centrated. 



Yellow. 



27. 



30. 

 31. 

 32. 

 33. 

 34. 

 35. 

 36. 

 37. 



38. 



39. 



Foimalin If large ex- 

 cess, gray 



Phenylhydrazine 



Chloroform _. 



C'hlorof orm -f NaOH _ 



Methvl alcohol + NaOH .... 



Ethyl alcohol + NaOH 



Amyl alcohol 



Amyl alcohol + NaOH 



Hypophosphorus acid 



Phosphorus acid. 



Phosphorus trichloride in 



NH4OH 



Sulphur dioxide j 



Acid sodium sulphite 



Blue- 

 green, un- 

 stable, 

 contains 

 sulphur 



Slowly, 

 faint pink 



C. Ammoniacal Solution of Silver Oxide. 



40. Formalin 



If large ex- 

 cess, yellow- 

 ish-gray 



+ 



Stable 







41. Formalin poured into silver 



Yellowish 





Purple, 







solution ; dilute _ 



gray changes 

 to purple 

 solution 





stable 







42. Hydrazine hvdrate 





+ 

 + 



Stable 

 Stable 







43. Hydroxylamine sulphate . . . 





44. Hypophosphorus acid 





+ 



Stable 







D. Water Siispension of Silver 



Oxide, filtered after treatment. 



45. Hydrazine hydrate 



46. Hydroxylamine 



Turbid, 1 ; 

 stable 1 ! 



E. Water Solution of Silver Nitrate, slightly acid, ivith Sulphuric or Nitric Acid. 



47. Phenylhydrazine ! 



48. Acid sodium sulphite, solidi 



or in concentrated solution 



+ 

 Blue- 

 green, 

 contains 

 sulphur, 

 turns black 



Coagu- j Coagu- 

 lated by I lated by 

 shaking | shaking 



