Final answer:
Roman Catholic monks illuminated manuscripts, creating highly valued and artistically decorated books using vibrant colors and precious materials.
Step-by-step explanation:
Roman Catholic monks not only copied texts by hand but they also illuminated manuscripts. This practice involved adding vibrant colors, illustrations, and decorations to the manuscript, making them highly valued and artistic creations. Monasteries served as significant centers of learning, and the illuminated manuscripts they produced were among the most precious objects of the Middle Ages and the Renaissance. Using parchment made of animal skins, monks would painstakingly write the text and embellish the pages with gold, vibrant colors, and intricate designs. These ornamental manuscripts often included illustrations of biblical events, portraits of saints, and other religious iconography, as well as sometimes featuring bejeweled book covers.