Spolvero
Term for a secondary cartoon used to transfer the design to the support, leaving the original cartoon intact (see CARTOON, §1). The word spolvero also describes the dotted outline produced by POUNCING, a method of transfer in which finely ground chalk is forced through perforations in the cartoon.
(second link below)

"Maren Nelson, former administrative assistant at the Minneapolis Institute of Arts and an assistant to Balma on the St. Thomas project, explains the process of fresco painting: "Before the smooth intonaco coat is applied, the ceiling is gridded using a snap-line coated in sinopia, a red earth pigment. [These] mark the transfer of the design to the ceiling. The design, called a 'cartoon,'... is outlined on gridded tracing paper. The cartoon then is perforated with a small needle to create an image of the design.
Next comes a step called 'pouncing,' [in which] tracing paper is positioned on the ceiling and tapped lightly with a muslin bag filled with dry charcoal. The pattern left on the plaster surface formed a kind of connect-the-dots road map for Balma and his assistants to follow. The perforated tracing paper was used twice, first to transfer the entire cartoon on to the rough plaster layer and then to mark each day's fresh intonaco coat."
(first link)

Eine weitere Übertragungsmethode war das Durchpausen mit einem Beutel,der mit hHlzkohlestaub gefüllt war.Dieses Verfahren wird ,,Spolverotechnik" genannt.Somit wurde der Entwurf auf dem intonaco punktiert.Die Wandmalereitechnik ist generell üblich.
http://home.media-n.de/gesamtsc/kgs/faecher/geschichte/toska...