Dear James: I have to replace my old, tarnished brass kitchen faucet. What are the basic steps to installing one, and are there any new types of brass faucets that won’t tarnish? — Karen F. Dear Karen: There is a brass fixture finishing technology that protects the brass so it will not tarnish. The brass body of the fixture is coated with a thin coat of a special brass alloy in a vacuum chamber. The finish not only never tarnishes, but it is als…