Anti tarnish treatment for old silver flatware

I am a custom picture framer with a request from a client. She would like to frame a single place setting along with a dish towel, recipe cards, etc. She does not care about food safety, as she will never use it. Also not concerned about preservation, as she is the only one interested in this neighbor's memories. I am looking for a small amount, not for repeated commercial use. Something I can apply myself that will look good for her for many years.

There are room temperature anti-tarnish dips available. You would probably only need a quart of the concentrate. Check online for anti tarnish solutions for silver. There are some companies that would sell a small amount.

You might use a piece of "pacific cloth" to highlight the spoon and seriously retard any oxidation for years.