I recently picked up these copper and brass candlesticks (Booth Coulter, Toronto, 1909-1928) and one of the bases has some verdigris. Should this be cleaned and what would be the best way to do this? I have read recommendations for and against the use of vinegar (a mild acid). Any advice?

There is no harm in using vinegar on your candlestick base. The location of the verdigris is ideal for this since you can contain the vinegar without cleaning the other areas. I suspect this set of candlesticks was intended to be polished when they were manufactured. (Unlike some Jarvie Candlesticks that were given a patina by the maker). Watch the action of the vinegar and remove it when you see the green has gone. Do not just leave it there and walk away! Good luck and let us know how it worked.

Fred