V.—Another method is to have the pearls, strung on a silk thread or wrapped up in thin gauze, mixed in a loaf of bread of barley flour and to have the loaf baked well in an oven, but not too brown. When cool remove the pearls.
VI.—Hang the pearls for a couple of minutes in hot, strong, wine vinegar or highly diluted sulphuric acid, remove, and rinse them in water. Do not leave them too long in the acid, otherwise they will be injured by it.
Glass Cleaning:
Cleaning Preparation For Glass With Metal Decorations.
Paste For Cleaning Glass.—
| Prepared chalk | 6 pounds |
| Powdered French chalk | 1 1/2 pounds |
| Phosphate calcium | 2 1/4 pounds |
| Quillaia bark | 2 1/4 pounds |
| Carbonate ammonia | 18 ounces |
| Rose pink | 6 ounces |
Mix the ingredients, in fine powder, and sift through muslin. Then mix with soft water to the consistency of cream, and apply to the glass by means of a soft rag or sponge; allow it to dry on, wipe off with a cloth, and polish with chamois.