"Oil is hot and fiery, almost like a summer night, where tempera is a cool breeze, dry, crackling like winter branches blowing in the wind." Andrew Wyeth
刻印の形は、画家や工房の指紋でもある。
黄金テンペラ画の刻印研究における二つの塔。
Erling S. Skaug, Punch Marks from Giotto to Fra Angelico, IIC Nordic Group, 1994.
Mojmir S. Frinta, Punched Decoration on Late Medieval Panel and Miniature Painting, Part I, Maxdorf, 1998.