Improve the logic of this paragraph:
The joining technique dates back to ancient times. Copper oxide painted as an interlayer and covered with some tallow or glue to hold some gold balls on to a gold article were heated in a reducing flame to form a eutectic at the bond area.
The joining technique dates back to ancient times. For example, copper oxide painted as an interlayer and covered with some tallow or glue to hold some gold balls on to a gold article were heated in a reducing flame to form a eutectic at the bond area.