Glue chip glass is a technique for decorating the surface of glass.
The glue chip process starts with the application of a layer of animal hide glue to the surface of the glass. Frequently, that surface is first sandblasted so that the glue has a better "grip". As the glue dries it shrinks and, in doing so, chips thin layers of glass from the surface, leaving a decorative finish.
Note of caution: Dogs don't know the difference between rawhide and animal hide glue loaded with razor sharp glass shards. If you decide to make your own glue chip glass, please dispose of the dried glue where there is no chance of a Fido finding it.