618 METHODS AND FORMULAS AMS 21.1 



21.1 Heitzman test. 1938 Mallory Mallory 1938, 293 



formula: 5% gelatin 75, 2% silver nitrate 15, 1% hydroquinonc 2.5 



21.1 Hewer 1933 see AMS 21.1 Ranson 1914 (note) 



21.1 Huber and Guild 1913 see AMS 21.1 Ranson 1914 (note) 



21.1 Humphreys 1939 608b, 15:151 



formula: water 100, hydroquinone 5, sodium sulfite 10 



21.1 Jahnel 1917 see AMS 21.1 Hanson 1914 (note) 



21.1 Jahnel test. 1933 Cajal and de Castro Cajal and de Castro 1933, 384 



formula: water 100, acetone 10, pyridine 10, pyrogallol 4 



21.1 Kallius 1893 764, 2:271 



formula: water 66, 95% ale. 34, hydroquinone 0.08, sodium sulfite 0.8, potassium 



carbonate 1.6 

 note: Curreri 1908 (766, 32:432) recommends gold toning after this. 



21.1 Kingsbury and Johannsen 1927 Kingsbury and Johannsen 1927, 83 



formula: water 100, 40% formaldehyde 6, hydroquinone 2, magnesium sulfate "a 

 minute quantity" 



21.1 Kolossow 1892 23632, 9:38 



preparation: Mix 20 25% tannin with 20 25% pyrogallol. Filter. Add to filtrate 35 

 water, 15 95% ale. and 10 glycerol. 



21.1 Krajian 1933 623, 17:127 



formula: water 60, acetone 10, pyridine 10, 40% formaldehyde 10, hydroquinone 1.2, 



sodium sulfite 0.25, sat. sol. gum mastic in 95% alcohol 10, V 21.1 Mayer 1884 0.05 

 note: Krajian 1935 (1829, 32:764) is identical. Krajian 1938 (1829, 38:427) omits the 



Mayer's albumen. 



21.1 Kranz 1924 14674, 608 



formula: water 100, gum arable 12.5, pyrogallol, 1 



21.1 Krautz 1924 test. 1928 Schmorl Schmorl 1928, 405 



formula: water 100, gum arable 8, pyrogallol 0.2 



21.1 Lauda and Rezek 1928 22575, 269:218 



formula: dissolve with heat 0.1 gelatin in 100 water. Cool. Add 3 hydroquinone 



21.1 Levaditi 1905 6630, 8 :845 



formula: water 100, 40% formaldehyde 5, pyrogallol 3 



21.1 Levaditi and Manouelian 1906 6630, 60:134 



formula: water 90, acetone 10, pyrogallol 3.6 



21.1 Levaditi test. 1916 Warthin 4349, 6 :56 



formula: water 77, acetone 8, pyridine 15, pyrogallol 3 



21.1 Liesegang 1911 11848, 3:1 



preparation: To 50 of a 50% solution of gum arable add 50 20% potassium hydro- 



sulfide. 

 note: The polassium hydrosulfide referred to is most easily prepared by passing H2S into 

 20% KOH to saturation. The solution is very unstable. 



21.1 Lobo 1937 test. 1948 Romeis Romeis 1948, 420 



formula: water 70, 40% formaldehyde 19, acetone 11, hydroquinone 0.3 



21.1 MacFarland and Davenport 1941 20540b, 16 :53 



formula: water 100, oxaHc acid 2, 40% formaldehyde 1 



21.1 Noguchi 1913 test. Schmorl 1928 Schmorl 1928, 407 



formula: water 95, 40% formaldehyde 5, pyrogallol 4 



