640 METHODS AND FORMULAS M31.1-M34,l 



31.1 Zirkle 1940 20540b, 15:149 



formula: water 20, acetic acid 15, proprionic acid 40, phenol 65, oleic acid 10, dried 



Canada balsam 10, ferric nitrate 0.5, carmine 0.5 

 preparation: Mix the balsam with the acetic and proprionic acids. Add the oleic acid 

 and then the phenol. Incorporate the water in which the ferric nitrate has been dis- 

 solved. Then mix in the dye. 



32 GUM DAMAR MEDIA 



Gum (himar is the natural e.xudate of Shorea iviesneri, but it is almost always adul- 

 terated and usually contains solid impurities. The raw gum should be dissolved in 

 chloroform, filtered, and evaporated until the chloroform is driven off. The purified gum 

 is then dissolved in lienzene or toluene to a suitable consistency. 



M 32.1 Formulas 



32.1 Cooke circ. 1920 Cooke circ. 1920, 49 



preparation: Warm together till dissolved equal parts of gum damar, benzene, and 

 turpentine. Filter. Evaporate to desired consistency. 



32.1 Vogt and Jung test. circ. 1890 Francotte Francotte, 248 



formula: Canada balsam 30, benzene 100, gum damar 30 

 preparation: Dissolve ingredients separately, then mix solutions. 



33 OTHER RESINS AND MIXED RESINS 



33.1 Formulas 



33.1 Artigas 1935 see M 21.1 Artigas 1935 



33.1 Chevalier 1882 Chevalier 1882, 327 



formula: chloroform 90, rubber 3, gum mastic q.s. to give required consistency 



33.1 Fremineau tcit. 1883 Chevalier Chevalier 1882, 297 



formula: Canada balsam 60, gum mastic 20, chloroform q.s. to give required fluidity 



33.1 Lacoste and de Lachand 1943 4285a, 20:159 



formula: toluene 100, rosin 120 



33.1 Noyer 1921 6630, 84:814 



preparation: Take decanted solution of mastic from M 21.1 Noyer 1921 and evaporate 

 to dryness. Redissolve in xylene. This solution was once known in commerce as 

 erenol. 



33.1 Rehm 1893 23632, 9:387 



formula: benzene 100, rosin 10 



33.1 Seller 1881 Seller 1881, 90 



formula: naphtha 17, turpentine 15, Canada balsam 45, damar 23 

 note: Seller {loc. cit.) recommended this either as a mountant or as a ringing cement, 



33.1 Southgate 1923 3506,4:44 



preparation: Digest 200 crude Yucatan elemi in the cold with 200 95% ale. Filter and 



evaporate filtrate to dryness and redissolve in benzene to a suitable consistency. 

 note: The solution of amyrin-free gum elemi thus obtained is stated to preserve Giemsa 

 or other DS 13.1 stains indefinitely. 



34 SYNTHETIC RESINS 



34.1 Formulas 



34.1 Deflandre 1933 Bui. soc. franc, microsc, 2 :07 



formula: coumarone resin 20, xylene 80, monobromonaphthalene 1 



