Although, this is actually a daily occurrence for me, I need help stabilizing the patina surface on my latest salvage yard discoveries. All of the copper guttering and brass plates have been sprayed with the garden hose to loosen some of the surface grime, my main concern is a black powdery substance the continues to come off when I brush it with a firm bristle scrub brush. (I haven’t used a brass brush because I do not want to remove the patina completely)
Do I need to be concerned about toxicity from the powdery substance? Should I seal it before I start working with it? Typically, I use Renaissance Wax as a final coat, should I apply that now? (My plan is to keep the patina on the copper and manipulate the 24 gauge metal without using heat or pickle.)
Thank you for any and all suggestions. I cannot wait to play with this ‘stuff’. BTW…the brass is already in the a vinegar bath…someone thought the brass plates would look better if they were painted gold…YUCK!!!