So…. Today I just tried arm and hammer super washing soda aluminum foil cleaning, and it turned the brass on my silver plated strad black. I used a cup of the solution with 5-5.5 gallons of hot water (5 quarts boiled, the rest approx 110°F). I left it there for 3-4 hours and the water was still somewhat warm. As I took off the foil I was very nervous seeing black on the exposed brass and a film coating on almost the entire instrument, and a rainbow color on some of the outside silver (photo below). I rinsed off and soaped it in warm water and scrubbed some to most of the black off. I’m going to try to polish it out with Hagerty’s silver polish.
What did this happen? Should I have soaped it first? Did I use too much of the washing soda? Are the rainbow areas there because the instrument got too hot? Has anyone had this happen to them? I don’t know if I will do this again, but need advice on this issue. Please respond immediately if you have any knowledge on this. Thank you. The link is
black brass picture by wolf_lupis - Photobucket