The Liber colorum secundum magistrum Bernardum ('Book of Colours according to master Bernard') is a medieval treatise on miniature painting and book illumination. Written in a Medieval Latin interspersed with several expressions in the Italian Lombard dialect it stems from 13th century Northern Italy. The eponymous magister Bernardus (or 'master Bernard') was most likely a cleric working in a scriptorium to whom later collections also attribute further artisanal instructions not related to book painting. It is contained within four manuscripts:
The original corpus ascribed to 'master Bernard' himself amounts to 56 recipes. These treat:
The Liber colorum was first published, based on three manuscripts, with a translation into Italian and a commentary by the Milanese conservationist Paola Travaglio in 2008, followed by a 2016 re-edition after the discovery of a fourth textual witness. In 2023 Travaglio and Thomas Reiser published a German version with an expanded commentary.