Hints on illuminating : with an essay on the art of ornamenting in gold or metals : describing a new and easy method of brilliantly and durably imitating the illuminated gilding of the Middle Ages (1870)
Lucien, Henry Montanell · London : J. Barnard and Son · leaf 60
Illumination of books and manuscripts · Gilding
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.