Hello I have two clan MacBean badges purchased nearly 20 years ago. I had not used one them for years it is one I purchased for my son and appears to be tarnished but did not respond to lemon juice and baking soda. I am not sure what the badge is made of, what the problem is and how to fix it if possible. It may just be an overly cheap one and not worth the trouble. I look forward to what help you can offer. Here is a picture. clan badge.jpg
I am new to forum I hope you will be able to see the image.
Thanks,
Doc MacBean