Resumen
During the last decades, manuscripts have become increasingly available through digitization and deposition in online repositories. This trend has very much facilitated primary source research, as scholars are no longer subjected to time- and effort-consuming processes such as travel, applications for photography permissions, and so on. In this framework, the authors set forth the results of research that deals with post-Byzantine panel-painting varnish recipes which were found in a hitherto unpublished Greek painting manual dating back to 1824. The recipes in consideration are compared to those existing in the renowned ?Hermeneia? by Dionysios of Fourna (early 18th century) painter?s manual. A brief discussion dealing with various pertinent terms, along with a note on data deriving from the analytical investigation of varnish samples stemming from post-Byzantine icons are also included in this work. The study reveals a shift towards lean and intermediate varnish recipes during the early 19th century that might reflect the progression of resins and oleoresins, and the gradual replacement of oil-based varnishes. In addition, a unique recipe describing various methods of varnish application is transcribed and commented upon. Finally, the analytical data revealed an unexpected employment of a protein-based varnish in a mid-19th century icon.