Paper turns yellow in part due to exposure to sunlight. You can see well preserved 17th century books today that are a similar whiteness and grain, not entirely

Paper turns yellow in part due to exposure to sunlight. You can see well preserved 17th century books today that are a similar whiteness and grain, not entirely covered in fugus either. A 20th century work would not have hen spelt as hean. There also appears to be foxing on both the fox and nude figure...