Silver plated? Not worth your time to extract. Plating puts such a small coating of silver on the object that the costs to extract it are more than any gains from the silver you are extracting.
Silver
Sure, you can eat it, but it'll tarnish the silver. Use stainless steel.
EPNS stands for Electro Plated Nickel Silver - another term for silver plate.
Nothing its plated
To clean silver plated items, gently wipe them with a soft cloth dampened with warm water and mild dish soap. Avoid abrasive cleaners or polishing compounds, as they can damage the silver plating. For tougher stains, you can use a silver polishing cloth specifically designed for silver-plated items.
Beresford plate as far as I can ascertain: john Septimus Beresford 1876..1890 your dish is silver plated rather than silver.
There is a seven-inch International Silver Company silver-plated candy dish that appears to match the description of your item (see discussion page) listed on eBay today [December 12, 2000] at a buy-it-now price of $9.95. Comparable dishes sell for $1.00 - $12.00. Silver-plated objects typically have little value as antiques because the silver content is extremely low.
I am not sure. I would be glad to tell you that your nearest antique dealer would probably be happy to help you. They might even buy it for some $$$ for you!
The FB Rogers Covered Butter Dish model 357 was made around the 1940s to 1950s. FB Rogers Silver Company, known for its silver-plated items, produced various styles during that era, and the 357 model is a popular collectible among vintage silver enthusiasts.
For many years, real silver flatware had to be cleaned by hand. The detergents used in dish washers contained chemicals that would cause real silver to form an unwanted patina of tarnish. In order to maintain its shine, silver that was cleaned in a washer had to be hand polished frequently. Today, most dish washer detergents use a milder formula that is safe for use on real silver flatware. Though silver must still be polished on occasion, it is less likely to cause silver to dull or patina with repeated use.
To clean gold plated sterling silver, use a soft cloth to gently wipe away dirt and smudges. Avoid using abrasive cleaners or polishing cloths as they may scratch the gold plating. If needed, soak the jewelry in warm water with mild dish soap, then rinse and pat dry thoroughly.
The stamp "2000" on a silver dish likely refers to the silver content, indicating that the dish is made from 80% pure silver. This marking is a common way to denote the quality or purity of the silver used in the dish.