OLIVE OIL AND ITS SUBSTITUTES. 



T AHI.K X X VI I. M/.x////v/-.sm/ nil. 



6 samples. Annali del Laboratorio chimico centrale dclle Gabelle, vol. 2, Gli Olii, pt. 2, p. 37. 



b 5 samples. 



<?2 samples. Jour. Ainer. chein. Boc., 1 *'.">. 17: '.:>.">. 



rf2 samples. Jour. Soc. Chcm. hid.. ISDS, 17: 989. 



el sample. Bulletin dn Ministerc de TAgriculture. 1895. p. l:v.i. 



/Annali del Laboratorio chimico centrale delle Gabelle, vol. 2, (Jli Olii, pt. 2. p. S7. 



It is probable that this oil is seldom if ever used as an adulterant of 

 olive oils, although it is frequently added to rape oil, and this may 

 find its way into olive oil. Means of detecting it in small quantities 

 are as unsatisfactory as for rape oil, and the analyst will scarcely lie 

 able to distinguish between the oils of this group. 



The presence of sulphur compounds in the oils of the Orucifera 

 gives a means for their detection. If the oils are saponified with alco- 

 holic potash and stirred with a silver spatula, the silver will become 

 blackened by the formation of sulphid. 



RAPE-SEED AND COLZA OILS. 



Rape-seed and col/a oils may be considered practically identical as 

 regards source and composition, and for convenience the terms are 

 considered here as being synonymous. This oil is derived from vari- 

 ous species of />/v/.v.v/Vv/ of the family ('rn<-'if, ,;> . and according to 

 Allen" i- used as an adulterant for olive oil. According to the Codex 

 . \limentariiis Austriacus rape oil or col/a oil is the oil from the field 

 cabbage ( ' ///wxv/V// 'v////yW/-/.v), but all the following oils are sold under 

 the name of rape oil: Colza oil from />/v/w/Vv/ ,w///yW/-/.v; rape oil 

 from ///v/.s-.v/Vw ct/injx .v/V/.v. variety //'//>'/*; rape oil from Brassica 

 >Y/////w/v'.v. variety rapa; Hederidi oil from /A//>////////.v Raphanistrwn 

 or field radish, and radish oil from Raphanus sctiivus. Although the 



Com. Org. Anal., &1 <!.. vol. L. pt. 1, p. 



