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Heritage Science
Fig. 5 | Heritage Science

Fig. 5

From: Study on microbubble of cellulose acetate microfilm of the Republic of China (AD 1912–1949) collected in the Second Historical Archives of China

Fig. 5

SEM image obtained with secondary electrons of the cross section of microfilm: a with microbubbles; b without microbubbles; c crystals in microbubbles indicating the one point where elemental analysis was performed; d the corresponding elemental mapping of P (yellow), C (red), O (green); e EDX spectrum collected at Point 1

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