This Gospel is an example of a “Codex Purpureus”. The parchment was dyed with purpled colourant, and written with gold and silver inks. Apparently, the “Codices Purpurei” had imperial associations. In this sense, this manuscript would have been a gift from Charles the Bald to the abbey of Saint-Denis, according to a legend. Source: gallica.bnf.fr / Bibliothèque nationale de France. According the site of the BNF, the reutilization of documents for a non-commercial purpose is free.