Bartholomaus Ignaz Weiss ( 1740 - 1814 ) was a German painter. Bartholomaus Ignaz Weiss s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 126.84 USD for Portrait d´un oriental en turban ; Croquis, études de têtes in 2004 to 22500 USD for PORTRAIT OF GEORGES DESMARÉES (1697-1776) AT HIS EASEL PAINTING A PORTRAIT OF JOHANN CHRIS