12 



FURIFICATION OF FISH-OIL, 



Refumption. 

 Lime, chalk, 

 fea-falt, and 

 alkali, are the 

 materials for 

 purifying oils. 



It appears from thefe feveral obfervations, that the cheapeffc 

 ingredients which Can be ufed for the edulcoration of trains 

 oils, are lime and chalk, which may, with the addition of a 

 proper quantity of folution of fea-falt or brine, be made to 

 procure a feparation of them from the oils, according to pro-? 

 cefs the firft, fo as to anfwer for fome purpofes; that the 

 lixiviate Gilt is the mofl powerful purifier of oils, and, with 

 the afljftarice of chalk and brine, will, without; heat, accords 

 ing to procefs the fecond, effect a very confiderable degree of 

 edulcoration ; and that lixiviate fait ufed with heat, with the 

 addition of lime and chalk, to fave a part of the quantity 

 which would otherwife be neceffary, and of brine to procure 

 a quick feparation, will perform an edulcoration fufficient for 

 all commercial purpofes, according to procefs the third ; but 

 that calcined lead and the ochrous earth of iron may, perhaps, 

 be applied in fome cafes with acjvant^ge, where the oil is not 

 defigned for efculent ufe, 



proeefs i. 

 Moderate puri- 

 fication. 

 Chalk and 

 flacked lime 

 agitated with 

 oil j fait water 

 added ; repofe } 

 deanution. 



PROCESS THE FIRST. 



For purifying Fijh-oil in a moderate Degree, and at a very little 

 Expence, 



TAKE an ounce of chalk in powder, and half an ounce of 

 lime flacked by expofure to the air; put them into a gallon of 

 {linking oil, and, having mixed them well together by flirring^ 

 add half a pint of water, and mix that alfo with them by the 

 fame means. When they have flood an hour or two, repeat 

 the flirring, and continue the fame treatment at convenient 

 intervals for two or three days j after which, fuperadd a pint 

 and a half of water, in which an ounce of fait is dUTolved, 

 and mix them as the other ingredients, repeating the flirring, 

 as before, for a day or two, l<et the whole then fland at reft, 

 and the water will fink below the oil, and the chalk fubfida 

 in it to the bottom of the veflel. The oil will become clear, 

 be of a lighter colour, and have coniiderably lefs fmcll, but 

 will not be purified in a manner equal to what is effected by 

 the other proceflfes below given ; though, as this is done with 

 the expence of only, one ounce of fait, it may be practifed. 

 advantageoufly for many purpofes, efpecially as a preparation 

 for the next method, the operation of which will be thereby 

 facilitated. 



PROCESS 



