MS 33.1 METAL STAINS 579 



33.1 Kalwaryjski 1938 test. 1939 Findlay 11360, 59:36 



preparation: To 50 10% silver nitrate add 50 ammonia. 



33.1 King 1937 1879, 38:362 



preparation: Add 20 10% silver nitrate to 80 5% sodium carbonate. Add just enough 

 ammonia to dissolve ppt. 



33.1 Krajian 1933 1789a, 16:376 



preparation: Add 1 10% sodium hydroxide to 29 10% silver nitrate. Add just enough 

 ammonia to dissolve ppt. Dilute to 100. 



33.1 Laidlaw 1929 608b, 5:239 



preparation: To 16 60% silver nitrate add 185 sat. aq. sol. {circ. 1.5%) lithium car- 

 bonate. Wash ppt. by decantation three or four times and suspend washed ppt. in 60 

 water. Add just enough ammonia to dissolve ppt. and dilute to 100. 



33.1 Lawrentjew test. 1933 Cajal and de Castro Cajal and de Castro 1933, 361 



preparation: To 100 20% silver nitrate add not quite enough ammonia to redissolve 

 ppt. first formed. Immediately before use add from 3% to 8% (according to experi- 

 ence) ammonia. 



33.1 Levi 1907 14225, 18:292 



prep.^ration: Mix 17 20% silver nitrate with 17 40% sodium hydroxide. Add just 

 enough ammonia to dissolve ppt. Dilute to 100 ml. 



33.1 Lillie 1948 see MS 33.1 Weil and Davenport 1933 (note) 



preparation: To 20 ammonia add 10% silver nitrate, drop by drop, until a faint 

 permanent-opalescence is produced. Dilute to twice the volume. 



33.1 Lobo 1937 test. 1948 Romeis Romeis 1948, 418 



formula: water 62.5, 95% ale. 37.5, silver nitrate 1.25, pyridine 2.5 



33.1 Long 1948 20540b, 23:69 



preparation: To 10 50% silver nitrate add, drop by drop with constant agitation, 

 100 sat. sol. lithium carbonate. Wash ppt. 5 times by decantation. Add not quite 

 enough ammonia to dissolve ppt. Dilute to 100, filter, heat to 50°C. for 30 minutes in 

 open vessel, cool, filter. 



33.1 Maresch 1905 23681,17:641 



prep.\ration: To 100 10% silver nitrate add 0.5 40% sodium hydroxide. Add just 

 enough ammonia to dissolve ppt. 



33.1 Martinez 1931 see MS 34.1 Martinez 1931 



33.1 Masson 1928 608b, 4:181 



preparation: Add to 12.5 20% silver nitrate enough ammonia to redissolve ppt. first 

 formed. Then add 20% silver nitrate drop by drop until a slight permanent turbidity 

 is produced. Dilute to 100. 



33.1 Paton 1907 1424b, 18:567 



preparation: Add 14% sodium hydroxide to 100 1% silver nitrate. Add just enough 

 ammonia to dissolve ppt. 



33.1 Penfield 1935 608b, 11:1007 



preparation: To 100 20% silver nitrate add just enough ammonia to redissolve ppt. 

 first formed, then add 3 drops excess ammonia. 



33.1 del Rio-Hortega 1916 21344, 14:181 



preparation: To 20 10% silver nitrate add 1.4 40% sodium hydroxide. Add just 



enough ammonia to dissolve ppt. Dilute to 100 ml. 

 note: Cajal and de Castro 1933, 211 wash the ppt. by decantation before re-solution. 



33.1 del Rio-Hortega 1917a 21344, 15:367 



preparation: To 25 10% silver nitrate add 75 5% sodium carbonate. Add just enough 

 ammonia to dissolve ppt. 



