"the only handwritten and illuminated Bible commissioned in over 500 years — since the advent of the printing press, and was created in the tradition of medieval handwritten manuscripts.
The calligraphy was done with goose-feather quills writing on vellum sheets created from calf skin. The painting was done with hand ground minerals and stones, and included silver, copper, and gold. To the extent that it was possible, the Bible was created with material and processes that replicate the way it would have been done during medieval times." from the seattle traveler