Leon Wyczółkowski’s pastels from the collections of professors’ portraits in the Jagiellonian University Museum – technology and conservation issues The article deals with technology and conservation issues concerning Leon Wyczółkowski’s six portraits from the Jagiellonian University Museum at Collegium Maius. The characteristics of damage related to the type of ground is discussed. Non-typical canvas grounds sprinkled with woolen and cotton fibre, the so called velour canvas, are described, along with conservation methods
