What is the purpose of the stained glass window putty?
A. The purpose of the stained glass putty is to seal the stained glass window and make it waterproof. The stained glass putty also strengthens the window. In the process of brushing away the excess putty we use whiting (powdered calcium carbonate). The brushing cleans the stained glass and darkens and beautifies the lead, giving the whole stained glass project a finished look.
