At present, colorful mud and clay are "three noes" products, which are directly packed in transparent plastic bags, and there is no information about manufacturers, raw materials, service life and so on. In order to reduce costs and compete at low prices, some enterprises will use the mixture of zinc sulfide and barium sulfate as lithopone additives to make the colors of mud and clay more vivid. This substance may cause skin allergy, redness, itching and other symptoms in children. Generally speaking, regular manufacturers will strictly follow the current national standards and enterprise standards when producing colored mud and toys, and will not use additives that may cause children's allergies.
What are the hazards of children's long-term exposure to heavy metals? Children have special physiological characteristics, and generally have a strong absorption capacity for heavy metals, but it is difficult to discharge them. Heavy metals are easy to form "enrichment" effect, which may produce muscle toxicity, leading to paralysis and paralysis of skeletal muscle and smooth muscle. Among them, heavy metal barium will change the permeability of cell membrane, and potassium may flow from blood to cells after enrichment, which will affect cardiovascular health and lead to chronic diseases.
Generally speaking, soluble barium in some plastic materials, such as barium carbonate, is harmful to human body. If children eat and contact by mistake for a long time, the initial symptoms are mild, such as nausea and vomiting, and long-term excessive contact may cause diseases and other hazards.