In the second half of the 19th century, Bohemia looked to the export trade and mass-produced coloured glass that was exported all over the world. Pairs of vases were produced either in a single colour of opaque glass or in two-colour cased glass. These were decorated in thickly enamelled flower subjects that were painted with great speed. Others were decorated with coloured lithographic prints copying famous paintings. These glass objects were made in huge quantities in large factories and were available by mail order throughout Europe and America. Many of them were not fine art but provided inexpensive decorative objects to brighten up ordinary homes. Reverse glass painting was also a Czech specialty. The image is carefully painted by hand on the back of a pane of glass, using a variety of techniques and materials, after which the painting is mounted in a bevelled wooden frame.