The medium blue house with tiny imprints of flowers and hearts below the window , Made of crystal , Handmade paperweight Exceptional Caithness Paperweights and Artglass, handcrafted in the heart of Scotland First a sand mould has to be prepared, shapes and textures pressed into the surface. A Vintage designer signed Caithness Glass for Stratton Jewelled Pin Sandcast Glass Collectible BOXED Caithness Crystal Blue Glass Dolphin Paperweight Art Glass Paperweight The next day when they are cool, the sand is brushed off the back and the sandcast is finished. Glass Caithness Our Blue House Sarah P Art Glass Working Method of Glass Paperweights: Sand casts are created in three stages. First a sand mold must be prepared, pressed shapes and textures on the surface Once the mould is full with glass it is left to cool for 3 minutes before the frame is removed and the sand and glass put into the kiln to cool slowly. Next the glass colours have to be added using templates and a sieve.