Children's stickers contain heavy metals such as formaldehyde and mercury, which can lead to chronic poisoning and even the risk of cancer.
Hazards of formaldehyde:
1. Irritation: The main harm of formaldehyde is the irritation of skin and mucosa. Formaldehyde is a protoplasm toxic substance that can combine with protein. When inhaled in high concentration, severe respiratory tract irritation and edema, eye irritation, and headache will occur.
2. Sensitization: Direct skin contact with formaldehyde can cause allergic dermatitis, pigmentation and necrosis, and inhalation of high concentration formaldehyde can induce bronchial asthma.
3. Mutagenicity: High concentration formaldehyde is also a genotoxic substance. Nasopharyngeal tumors can be caused by inhalation of high concentration of experimental animals in the laboratory.
4. Highlights: headache, dizziness, fatigue, nausea, vomiting, chest tightness, eye pain, sore throat, poor stomach, palpitations, insomnia, weight loss, memory loss, and autonomic nervous disorders; Long term inhalation by pregnant women may lead to fetal malformation and even death, while long-term inhalation by men may lead to male sperm malformation and death.