Old and leaky leaded lights to be renovated should be taken out of the window frames, laid flat on a board, and painted all over with a rather stiff paint of red and white lead and linseed oil, using an old, nearly worn-out paint brush. To force the cementing material well into the lead cames, pressure must be applied to the brush, which should be drawn across the cames. The glass can be cleaned by rubbing with old rags or wisps of hay, and finally polished with clean pieces of rag or hay and wood ashes. The cement may have to be picked out with a pointed piece of wood from the corners of the squares of glass. Finally dust some lampblack over the whole to darken any edges of the cement that may be visible. Both sides of the lights should be treated with the cement.