This is a thick glass made by placing a number of coloured glass layers on the top of the pea .
The technique consists in blowing a big ball of coloured glass and applying it over the pea.
The master keeps the pea and the servente prepares the very thin blown coloured glass.
The process can be repeated many and many times and also alternated with iridescenza to obtain striking effect.
A long time of apprenticeship and a great coordination through the staff of the piazza is essential for this process. Only the best furnaces craft glass products using the "a sbruffi" technique.