[Rgmk]

I want to buy silver spoon to put it in the water to produce silver ions in it. What purity of the silver have to be used?
There are many spoons in the Internet that have black residue. Can I buy this spoon? Do I need to remove black residue before I start using it?
It is better to buy new spoon from the shop or it is no difference between new spoon from shop and old spoon from the Internet?
Sterling Silver is 925 it means that 75 is another admixtures. Does old silver has the same admixtures as the new one?

[Corribus]

Metallic silver tarnishes due to presence of sulfides (e.g., H₂S) in the atmosphere. This results in a surface layer of silver sulfide, which appears brown to black depending on the extent of tarnish. Tarnish will dissolve in acidic solution as well, so really it should not matter if the spoon is tarnished, but it is easy enough to polish away with commercially available silver cloth. Often you can do this dry - rubbing action alone can remove the surface tarnish leaving metallic silver beneath.

Silver salts have variable solubility in water, so depending on what you use to dissolve your silver, you may find various precipitates.

Silverware and other silver items should be stamped with the exact alloy designation, so you should be able to look up the purity using online resources.

[Rgmk]

Ok. It means that if I buy spoon with surface tarnish and remove it I can use it to put to water and produce Ag ions. Tarnishing surface is not harmful to health? Even if some of it remains on spoon and I will put spoon in to water?

[Hunter2]

What is the purpose of it. To put a silverspoon in water will not produce much silverions, because Silber is a noble Element. The Tarnish is no problem, because if you er with a Silber Spion you get everytime it in your mouth.

[Borek]

if you er with a Silber Spion

Please pay attention to what you write, this is completely unreadable.

[Hunter2]

Sorry its the automatic language corrector.

Here again

What is the purpose of it. To put a silver spoon in water will not produce much silver ions, because silver is a noble element. The tarnish is no problem, because if you eat with a silver spoon you get some silver ions in your mouth everytime.

[Rgmk]

I have read that putting silver spoon or another silver item to water produces Silver ions in water
https://www.askaprepper. com/why-you-should-put-a-silver-coin-in-water/
I just wanted to know if I will buy an old spoon with tarnish on it, is it ok to put it in water. You said it can be put in it and it is no harmful.

[Borek]

I have read that putting silver spoon or another silver item to water produces Silver ions in water

In trace amounts - yes. But silver is a noble metal, so the amounts will be very, very low. Whether it is enough to keep water safe, I have no idea (but I strongly doubt, it sounds like a case of ppl combining random ideas they have read somewhere and suggesting them as a solution without understanding underlying principles and checking validity).

I just wanted to know if I will buy an old spoon with tarnish on it, is it ok to put it in water. You said it can be put in it and it is no harmful.

Yes, tarnish won't matter when it comes to safety. At least as long as we are talking about natural tarnish that appears on the surface of silver items when they are exposed to the air.