What does the quick-talking ghost sister-in-law mean in Das Kapital (in the form of value or exchange value)?

Ghost wife: Henry IV, a British Shakespeare play, describes the ghost wife of an innkeeper: she quarrels with John Fausteff, who calls her an "otter" and an "elusive thing". Sister Gui was quick-tongued, and retorted, "It's really wrong of you to say that about me. You all know that I am an honest woman and never hide my face, you villains. "

Marx used "sharp mouth, sweet mouth, sweet mouth" to describe the objectivity of commodity value. As the condensation of human abstract labor, commodity value is the product of certain social relations, which is not only clear at a glance, but also does not contain any natural material atoms. No matter how people look at goods over and over again, they still can't see or feel the value. Guisao, who is sarcastic, is different. She "never hides her face" and can clearly see her true colors.