3Mi On the Edulcoration of Fish - Oil. 
have been mixed some hours, or a whole day, add an 
ounce of pearl-ashes dissolved in four ounces of water, 
and repeat the stirring as before. After they have been 
so treated for some hours, put in a pint of water in which 
two ounces of salt are dissolved, and proceed as before : 
the oil and brine will separate on standing some days, 
and the oil will be greatly improved both in smell and 
colour. Where a greater purity is required, the quantity 
of pearl-ashes must be increased, and the time before the 
addition of the salt and water prolonged. 
If the same operation is repeated several times, dimi- 
nishing each time the quantity of ingredients one half, 
the oil may be brought to a very light colour, and rem 
dered equally sweet in smell with the common sperma- 
ceti oil. 
By this process the cod-oil may be made to burn ; and, 
when .it is so putrid as not to be fit for any use, either 
alone or mixed, it may be so corrected by the first part 
of the process as to be equal to that commonly sold: but 
where this process is practised in the case of such putrid 
oil, use half an ounce of chalk and half an ounce of lime, 
PROCESS THE THIRD. 
To purify Fish- Oil with the Assistance of Heat , where 
the greatest Purity is required , and particularly for 
the Woollen Manufacture . 
Take a gallon of crude stinking oil, and mix with it a 
quarter of an ounce of powdered chalk, a quarter of an 
ounce of lime slaked in the air, and half a pint of water ; 
stir them together, and, when they have stood some 
hours, add a pint of water and two ounces of pearl-ashes, 
and place them over a fire that will just keep them sim- 
mering, till the oil appears of a light amber colour, and 
has lost all smell, except a hot, greasy, soap-like scent. 
