The big pen is a writing instrument, which is a general term for a whiteboard pen, a signature pen, a highlighter pen, a taro pen, and a colored pen. Big pens can be divided into oily and water-based two types, which are widely used. The big pen is an important member of the writing stationery. So, what are the precautions for the purchase of the big pen? However, many consumers may not know that there are certain amounts of soluble heavy metal elements such as lead (Pb), barium (Ba), and strontium (Sb) in the watercolor pen, the ink of the big pen and the surface coating of the pen. ), cadmium (Cd), mercury (Hg), arsenic (As), selenium (Se), chromium (Cr), and the like. In general, children and students have the habit of biting, so the chances of inhaling these harmful substances are relatively large, and when the body does not consciously and excessively ingest these harmful substances for a long time, it will cause harm to the human body to a certain extent, especially to children. And the injury of adolescents, acute and chronic poisoning, resulting in various symptoms, such as dizziness, anemia, vomiting, lack of energy, white blood cell decline. If the size of the pen of the watercolor pen and the big pen is too small, the underage student inadvertently inhales in the mouth, and the cap does not have a vent hole. When the cap is stuck in the throat, the accidental suffocation may occur due to obstruction of the trachea, which is life-threatening. Therefore, the purchase of watercolor pens, big pens, first of all should consider its safety performance, pay attention to the implementation of the standard number marked on the product packaging (should be GB21027-2007), can be preferentially selected products marked "non-toxic" or "environmental". When purchasing watercolor pens and big pens, you should also consider their writing performance. The writing water is normal, the stitches are smooth, no obvious lightening, broken wires and ink leakage. The appearance of the pen is smooth and has no waste. The whole pen and accessories have no obvious skew or gap. There should be no leakage of ink on the head or tail of the pen. When purchasing, you should also pay attention to the safety of the cap. The diameter of the cap should be greater than 16mm, or the cap has a venting hole to ensure a certain amount of air circulation. Consumers should purchase as much as possible in large shopping malls, supermarkets or professional commercial buildings, and purchase products with a certain brand reputation as much as possible. In addition, you should pay attention to the use of hygiene, do not take food, use a watercolor pen, a big pen, after use, you should wash your hands in time to prevent "sickness from the mouth." Do not leave the cap in your mouth to prevent accidental ingestion and life-threatening.
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