Myth: Silverplate doesn't tarnish like genuine silver. In truth, both will tarnish, because both are genuine silver. The difference is, sterling is sterling silver all the way through; plate only has a thin skin of silver over a base metal. Stainless steel doesn't tarnish.
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925 is the Sterling Silver mark of purity. It can only be used for silver, never ever for plate. If it was asseyed in England for example it would also, by law have to be stamped with the Assey office mark, year letter mark, monarch head and lion marks and the makers mark.
It should be marked sterling. Please be aware that pewter, silver plate and sterling silver and other base metals will all tarnish with time, so that is NOT a reliable indicator of the composition of the item.
Silver plate is marked EPNS (electro-plated nickel silver) or 'Plate' with usually other words and/or maker's marks.
9. All of the above are true but to know if the antique is silver or silver plated, you will need to test it. There are electronic and acid testers on the market specifically for this purpose. If it is jewelry then you can ask a jeweler to test it for you. When using acid testers, it is advisable to test in an inconspicuous place on the silver, otherwise, the acid will ruin the finish of the jewelry if it turns out to only be silver plated. We at YearsAfter.com test our unmarked sterling silver jewelry and it takes about 6 seconds. It's very easy but if you are using acid, please be careful and follow the instructions.
Sterling silver is an alloy of silver containing 92.5% by mass of silver and 7.5% by mass of other metals, usually copper. 925 is a mark to indicate purity of the silver.