Trailed glass is a free form of decoration applied by hand. It usually entails pulling threads off a gather of coloured glass and applying it over the surface of a blown vessel in a random fashion.
It should not be confused with threaded glass on which the trail of glass is applied uniformly starting at one end of the parison, wrapped around the glass to create a thread along its length as desired. The aid of an apparatus is used in order to obtain the uniformity of threading.
Stevens & Williams applied trailing glass to wares known as Fibrillose and Silveria.