You can wear gloves if you prefer, I then sprinkle alittle in my sink, using a soft toothbrush I dip the toothbrush into BKF and gently brush the item, as you can see my item was darken pretty much.
I rinse with alittle soap and water and you will see the brillance right away, if you didn't get the look you want you might have to repeat until you do, doesn't take long thou. As you can see my piece came out very brillant and the details show up very nicely.
End result the creation of these lovely earrings.
It also says it good for copper, that I haven't tried yet, thanks for looking, Michele