Window putty is a type of adhesive used to secure glass panes in window frames. It is typically made from a mixture of linseed oil, chalk, and other materials, which gives it a malleable texture. This allows it to be easily shaped and applied around the edges of the glass, creating a seal that helps prevent drafts and moisture from entering. Once applied, window putty hardens over time, providing a durable hold for the glass. It is commonly used in the restoration of older windows and can also be painted over to match the surrounding frame, enhancing the overall appearance of the window.