If not, buy rottenstone in a paint store, wet the stain with any kind of oil, sprinkle rottenstone on the oil and rub with your hands.
12.
Put some oil ( any kind will do ) on the stain and sprinkle a little rottensone on the oil, making sure the rottenstone is wet with the oil.
13.
This is how to use it : Apply water to the stain, sprinkle just a bit of the rottenstone on the wet spot, and rub with your hands.
14.
Or, wet the stain with any kind of oil, sprinkle a bit of rottenstone ( sold in paint and hardware stores ) on the oil, then rub.
15.
If that does not work, wet the stain with any kind of oil, then sprinkle rottenstone ( sold in paint stores ) on the oil so that it becomes wet with the oil, and rub.
16.
When dry, the damp surface was pumiced smooth, then buffed with a linen cloth impregnated with Tripoli ( a siliceous rottenstone ) and charcoal; finally it was buffed with oiled felt; beeswax was sometimes used for this purpose.
