[Data and Calculations]

Images and marked data cards on degrading cellulose acetate extracted from file PP/CRI/H/1/41/2.

1955-1956

1 file Six photographic images (b/w, 51/2" x 41/2") of polyglycine II, and twelve rectangular plastic data cards.

This item is fragile. Email library@wellcomecollection.org to request access to the physical item.