This section is from the book "The Complete Cook", by J. M. Sanderson. Also available from Amazon: The Complete Cook.
For every six pounds of sugar required to be clarified, take one quart of water, the white of an egg, and about half a teacupful of bullock's blood. Less than a pint will be sufficient for 112 pounds; but if a very fine, transparent, and colourless syrup is required, use either charcoal, finely powdered, or ivory black, instead of the blood. Put the white of the egg in the water and whisk it to a froth, then add either of the other articles mentioned, and the sugar, place the pan containing the ingredients on the stove-fire, and stir them well with a spatula, until the sugar is dissolved, and is nearly boiling. When the ebullition commences, throw in a little cold water to check it; this causes the coarser parts to separate more freely, by which means the whole of the impurities attach themselves to the clarifying matter used; continue this for about five minutes, using about one pint of water to every six pounds of sugar, or more, until you consider the whole of the dross is discharged, and there remains a fine clear syrup. Then place it by the side of the stove, and carefully remove with a skimmer the scum which has formed on the top: it may also be taken off as it rises, but I find the best method is to let it remain a short time alter it is clari fied before it is removed, otherwise, if you take it off as it rises, part of the syrup is also taken with it. When either charcoal or black is used, it must be passed through a filtering-bag made of thick flannel, in the shape of a cone, having a hoop fastened round the top to keep it extended, and to which strings are sewn that it may be tied or suspended in any convenient manner: what runs out at first will he quite black; return this again into the bag-, and continue doing so until it .runs fine and clear.
If a little lime, about a spoonful, or any other alkali is added to the sno-ar with the water, etc, it will neutralize the acid which all raw sugars contain, and they will be found to stand much better after they have been manufactured, by not taking the damp so soon. This is not generally done by the trade, but it will be found beneficial if practised.
 
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