John paul III - 3-8-2020 at 11:38
I have a silver oxide stain on my plastic window sill. How could i remove it? Would KNO3+H2SO4 work or will it make it worse by forming silver
sulfate?
AJKOER - 3-8-2020 at 13:40
Per Wikipedia (https://en.wikipedia.org/wiki/Silver_oxide):
"It is soluble in ammonia solution, producing active compound of Tollens' reagent. A slurry of Ag2O is readily attacked by acids"
Bedlasky - 4-8-2020 at 06:22
Sodium thiosulfate is also good option.
woelen - 4-8-2020 at 10:07
The mildest way to get rid of the oxide layer is dissolving some NaHCO3 or Na2CO3 in water. Put a piece of aluminium foil in the solution and put the
silver object on the aluminium foil. After a few tens of minutes the silver will look much lighter and cleaner.
Maurice VD 37 - 8-8-2020 at 11:12
The best method for removing silver oxide stain is using ammonia solution or sodium thiosulfate. The use of aluminum foil will just transform the
oxide into silver metal. And the stain has changed composition, but it is still there.