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The effect of various concentrations of citric acid on the eggshell surface (scanning microscope). CA0, control group; CA10, CA15, the concentration of citric acid at 10 and 15%, respectively; CA0, the permeable eggshell pore visible in cross-section (white arrow); CA10, the eggshell pore sealed at the external surface due to the effect of citric acid (white arrow); CA15, visible changes in the integrity of the eggshell (white arrow heads).
