Fig. 3From: A diagnostic tool for assessing the conservation condition of cellulose nitrate and acetate in heritage collections: quantifying the degree of substitution by infrared spectroscopyμFTIR analysis a cellulose nitrate reel (ANIM): an area of the reel which retains its elasticity has a calculated DS 1.89 and hardness (Shore A) 96 ± 1.02 and an area cracked and brittle presents DS 0.79 and hardness (Shore A) 75 ± 1.67Back to article page