| 摘要 |
<p>CLEANING SILVER A method of cleaning a silver of silver-plated article (A) comprises (i) placing at least one piece of perforate aluminium or aluminium alloy sheet (B), preferably a thin sheet with a regular pattern of holes (L or M), in a container (C) having a non-metallic inner surface; (ii) adding hot water (D) sufficient to cover the article; (iii) adding sodium carbonate (E); (iv) immersing the article in contact with the aluminium for a brief period, long-ingrained tarnish being (v) gently scrubbed off with a brush (F); removing the article from the container; (vi) rinsing the article in hot soapy water (G), aided by a mop (H); (vii) rinsing the article with clear hot or cold water (J); and, finally, (viii) polishing the article with a soft clean cloth (K). The many edges (N) of the holes (L or N) in the aluminium (B) promote the liberation of nascent hydrogen bubbles (Q) and leads to through contacting of the article (A) with the hydrogen to effect the cleaning by reduction of silver sulphide.</p> |
