sentences:  Throughout his career Guarneri used a high quality oil varnish, the recipe of which was probably learned from his master Nicolò Amati, though evidence of the use of dryers is sometimes apparent specially thus providing a Brescian hue to some of the instruments of Casa Guarneri which was never done by Amati.The color varies from chestnut brown, orange brown, to brown-red.Probably his most famous instrument is the "Conte Vitale" viola of 1676.