To remove Brunswick black from a stone mantelpiece previous to painting it, use American potash dissolved in water, and made into the consistency of paste by adding newly slaked lime. Apply this with an old brush, and let it remain on for a few hours, then wash off; if the first attempt does not remove the black, repeat the process. Care must be taken when using the potash, as it is dangerous to fingers and nails; should any of the liquid get on the hands, they should be at once well washed in water containing a. little vinegar or a few drops of acid.