did you use brasso to polish the bell?
I have an old steam train bell which is brass but I can never get it gleaming....possibly because I dont polish it every day and the mud wasps try to nest and the asian geckos **** and **** on it. It hangs outside my front door on a chain as a door bell. Funny , it's right in front of your face but hardly anyone rings it.
I know this is a naval thread but if there are any avid steam engine freaks it is/was built by Neilson & Co. Glasgow. 1865. has a number 1170 in the centre of the brass id plaque.

