Salt brine is toxic, but salt brine tofu is definitely not toxic, because ordering tofu is a chemical change. The brine itself is toxic because it is a mixture of magnesium chloride, sodium chloride and magnesium sulfate. However, in the process of ordering tofu, the chlorine element in it By replacing the calcium ions in soy milk, the brine itself is no longer brine and therefore non-toxic. Of course, chemical changes have a quantitative problem. If there is too much of one side, there will be excess. If too much brine is added, the tofu will indeed be poisonous due to incomplete reaction. But if the tofu is added with too much brine, the tofu will become black and even a fool will not eat it. You see. The white tofu must have completely reacted with the brine. There is an old saying: "Put some tofu in brine, and one thing will be reduced."