Hi Guys, last night I found a great way to blacken your metal tracks with Blacken it solution.. I used two jar caps from old Yankee candle jars as cups. They are made of Glass and have a plastic ring around the top that make for easy solution pour out. roll the track up and put one in each jar lid/cup. there is just enough solution in a bottle of blacken it, to cover each track and cleanup is a snap. it beats using up the Tupperware ha hahaha.