Once the glass has been cut and painted, the pieces are assembled by sloting them into H sectioned lead cames of appropriate widths. All the joints are soldered together on both sides of the panel. The glass pieces are then prevented from rattling and the window made waterproof by forcing black leaded light cement between the glass and the lead cames using a stiff brush.
White chalk called whiting is then applied to help dry and clean the cement from the surface of the glass and lead. The final process which takes place after the cement has set, is the application of patina and polish. The patina gives the lead its slate black appearance and the polish further enhances it by deepening the colour and giving it a deep shine.