The provided context does not contain relevant information to answer your question. Based on general knowledge, here are the professional methods for determining if old silverware is made of solid silver.
The most reliable method to identify genuine silver is to look for hallmarks or stamps, which are typically located on the back of the handle or stem. The most common mark for sterling silver is the word "Sterling" or the number "925," which indicates the piece is composed of 92.5% pure silver. Other numerical marks, such as "900" or "800," also denote a high percentage of silver content, common in European silver. If you find markings such as "EPNS" (Electroplated Nickel Silver), "Silver Plate," "A1," or the name of a known silver-plating company, the item is not solid silver but rather silver-plated.
If hallmarks are absent or worn, you can perform a few simple physical tests. Silver is non-magnetic, so a strong magnet should not attract the silverware. If the magnet sticks, the piece is likely made of a different base metal and is only silver-plated. Another characteristic of real silver is tarnish, which appears as a black or yellowish film resulting from oxidation. While this may seem undesirable, the presence of tarnish that can be polished off is often a good sign of authenticity, as stainless steel and other common metals do not tarnish in the same manner.
For a more definitive assessment, you can observe the item's thermal conductivity with an ice cube. Silver is an excellent conductor of heat. If you place an ice cube on a piece of silverware, it will begin to melt almost instantly, much faster than it would on a piece of silver-plated or stainless steel flatware at the same room temperature. For valuable or antique pieces where certainty is crucial, consulting a professional jeweler or a reputable precious metals dealer is recommended. They can perform a chemical acid test or use an XRF spectrometer for a precise analysis of the metal's composition.
