In re-staining bowling green bowls, any grease, dirt, oil, or varnish must be removed by re-turning in a lathe or by well scouring with strong soda water and pumice powder, or powdered Bath brick. "When the bowls are quite clean and dry, proceed as with new bowls. Boil in an old iron pot for several hours 1 lb. of logwood chips, 2 lb. of black or green copperas, 1/2 lb. of extract of logwood, 1/44lb. of indigo blue, 2 oz. of lampblack, 1 oz. of nut galls, and 1 gal. of water. Strain through llannel, and apply hot; two or three coats may be necessary if the bowls are of hard wood, and the blackness may be intensified by brushing over, when dry, with another stain made by steeping plenty of rusty nails or iron turnings in common vinegar. A French black stain gives very good results.