This section is from the book "Cyclopedia Of Painting", by George D. Armstrong. Also available from Amazon: Cyclopedia of Painting.
Mix together 1/2 pound of pearl-ash, 1/2 pound of soft soap, and 1 pound of whiting. Boil them until they become as thick as paste, and let the mixture cool. Before it is quite cold spread it over the sur-face of the mai-ble and leave it for at least a whole day. Use a soft water to wash it off, and rub it well with soft cloths. For black marble nothing is better than spirits of turpentine.
To polish marble, such as table-tops, the following mode is followed by masons: With a piece of sandstone with a very fine grit rub the slab backward and forward, using very fine sand and water, till the marble appears equally rough, and not in scratches, next use a finer stone and finer sand, till its surface appears equally gone over, then, with fine emery powder and a piece of felt or old hat wrapped around a weight, rub till all the marks left by the former process are worked out, and it appears with a comparative gloss on its surface. Afterwards finish the polish with putty powder and fine clean rags. As soon as the face appears of a good gloss, do not put any more powder on the rag, but rub it well, and in a short time it will appear as if fresh from the mason's hands.
Make a paste with fullers' earth and hot water, cover the spots with it, let it dry on, and the next day scour it off with soap. Another recipe is to take 1/4 pound soft soap, 1/4 pound powdered whiting, 1 ounce soda, piece of blue the size of a walnut. Boil all together for a quarter of an hour, and rub over the marble while hot. Leave it on for twenty-four hours at least, then wash off, and polish with a coarse flannel. The above quantity is quite enough for an ordinary mantelpiece.
 
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