I was curious as to what chemicals are actually used in a No-Rust product.  I dug around on their website  [...]  but could not find exactly what is used (they list it as proprietary on the safety sheet).  I was able to determine that it is a low risk substance and that the only harm that should come to you would be if you were to remove the chemical impregnated sponge and eat it.  In that case you probably have larger difficulties in life anyway.After reading through the information I decided to do a little experiment. I polished up my good silverware (it is annoying to polish as it has many small crevices and engravings that collect tarnish).  I took a third of the silverware and put this product in with it.  I usually keep a piece of regular chalkboard chalk in with the silverware (this is supposed to absorb moisture and slow down the rate of tarnishing) so I kept a third of it with the chalk.  The other third I did nothing to at all.  Put each in a plastic box.  Three weeks later the silverware with nothing is showing some tarnish.  The chalk and No/Rust are not showing any black.  I tried to take photos, but the detail does not show up.I will try to remember to check the difference at the end of the 90 days (that should put me around Thanksgiving when I will use the silverware again) and report back.  I wanted to get this review up, because I am not sure when the product will be released.I do feel like I will need to rinse off the silverware with the No Rust, as I do not know what chemicals are used.  The website says it is approved for use with food containers, but unless I actually know what that chemical is, I will have to rinse them off.I am giving it 3 stars for now, because it does work better than nothing I do not know the cost and I have some concerns about not know what chemicals are used.  Once I see if it works better than chalk I will revise my rating.**UPDATETook them out at Thanksgiving,  I notice a little less tarnish than the chalk but not a lot. We live in a dry area, so I am not sure if there would be a difference in someplace with more humidity.**UPDATESome difference at Easter, but not enough to make me continue using them.