For Cleaning Marble
Muriatic Acid two lbs., Acetic Acid one-half lb.,
Verdigris one-quarter ounce. Mix and apply with a brush. Wash the stone
after with sponge and water. After the stone is clean rub it smooth
with Pumice Stone, keeping it wet with water. After some little
practice you can clean an old, dirty tombstone so that a marble cutter
cannot detect it from being new work.