Testard, Robinet (fl.1470-1523); French. Medium: vellum. Date: 15th Century. Medieval manuscript possibly made for Louise of Savoy, wife of Charles of Angouleme; Reseda commonly known as 'Dyers Rocket' and used as yellow dye; Euphorbia seeds are natural laxative; Provenance: National Library, St. Petersburg, Russia. Photographic Rights The Bridgeman Art Library.