This glass was invented by Carlo Scarpa for Venini & Co. in 1940.
On the vitreous mass of an object still on the blower's pipe, small balls of coloured glass are applied and then pulled along to leave a slight coloured trace, reminiscent in actual fact of the stroke of a brush ( pennellata ).
This operation is repeated several times until the entire surface of the object is covered over.
Opaque glass is used in degrading shades (yellow, orange, red) to obtain a slightly iridescent surface.
Lamp diffusers have also been made with this technique.
There are not many items in pennellato glass, a rare and refined product by Venini & Co.