Victorian Opalescent Glass
editIf you are looking for a particular type of glass to collect, then this might be something to look into. There are many Victorian pressed pattern glass pieces made in Opalescent colors still out there to be found, but they are quickly getting harder and harder to find in good condition. There are books available on the subject. It's recommended that you first purchase a couple of these books before you start to collect so that you know what you are buying is authentic. [1] is a good place to start.