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. 2021 Jan 16;100(4):100995. doi: 10.1016/j.psj.2021.01.018

Figure 2.

Figure 2

The effect of various concentrations of citric acid on the eggshell surface (magnification 8 × ). CA0, control group; CA5, CA10, CA15, CA20, the concentration of citric acid at 5, 10, 15, and 20%, respectively; CA0 and CA5, well visible shell pores without visible changes (white arrows); CA10, pores are shallower (white arrows); CA15, almost no visible pores (white arrow) and visible smoothing of the shell surface (black arrow head); CA20, the citric acid salts visible as the form of white powder (white arrow heads).