Many items can cause tarnishing - so many so, that it's nearly impossible to keep the lustre. No one likes that ugly yellow-black colour, and with so many sources online arguing about the best methods of cleaning, it can be overwhelming. That's why we've made a list of what you need to know. [caption id="attachment_942" align="aligncenter" width="640"] Courtesy of: eLLen via Flickr.com[/caption] What is Tarnishing and What Causes it? That yellow or black colour is a form of corrosion. Unlike rust, tarnishing doesn't actually erode the item, so there's still a chance to save it. Tarnishing isn't limited to silver; brass, copper, and...