According to "Koyo Gunkan" (record of the military exploits of the Takeda family), when Nobunaga gave Shingen a gift of kosode (a kimono with short sleeves worn as underclothing by the upper classes), Shingen gave attention to the lacquer case in which kosode was contained, and he found out that the lacquer case was coated with many layers of lacquer after examining it by tearing, etc.
甲陽軍鑑によると、信長から小袖が贈られた時に、信玄はそれが入れられていた漆箱の方に目をつけそれを割るなどして調べると、それは漆を何度も重ね塗りしたものであった。