What do two bars, one deep and one shallow, mean? In the female reproductive system, the mucosal tissue on the inner wall of the vagina secretes leucorrhea all year round. This is a self-protection mechanism of the human body to maintain a sterile environment in the private parts. Generally speaking, leucorrhea is usually transparent or white and has a dense texture. However, under special conditions, such as physical abnormalities or pregnancy, the leucorrhea will change in different colors, textures and shapes, especially the color of the leucorrhea, which is more likely to attract attention. The two lines, one dark and one light, mean that the color of the leucorrhea changes from the original leucorrhea under certain circumstances.