Yale University has put together a teaching kit that travels to classrooms on Yale's campus to "support the study of the medieval and early modern book as material artifact". What a great idea!
We can benefit too, if only virtually. Their blog archive addresses such topics as pigment manufacturing process, bookbinding terms and models, and the online version of their ink and pigment sampler is interesting, as is the online version of their leather and parchment sample set. There is also a PDF of medieval ink and pigment recipes.