Patent model for process for preparing autographic stencils. This patent model demonstrates an invention for preparing paper stencils by coating paper with a gummy solution such as collodion, and then writing on it with sulphuric acid or another corrosive liquid; the invention was granted patent number not on view

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Size: 1709px × 1463px
Photo credit: © SBS Eclectic Images / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: arts, culture, graphic, printing