Fig. 2 | Heritage Science

Fig. 2

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. 2

Optical and SEM microscopy of microbubble disease of cellulose acetate microfilm: a Round ball-like shapes are more regular bubbles viewed with an optical microscope using transmitted light; b Irregular bubble shape viewed with an optical microscope using transmitted light; c SEM images of the microfilm without microbubbles; d SEM images of the microfilm with microbubbles

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