Characteristics of water discoloration label (disappearing type)
Water discoloration refers to the phenomenon where water-based silk screen printing ink appears white, becomes transparent upon contact with water, and returns to its original state after drying. Due to its transparency upon contact with water and absence of harmful materials, it has obtained EN71-3 testing and is a safe water-based silk screen color changing ink suitable for printing various types of adhesive stickers.
Substances that change color when in contact with water include:; Anhydrous copper sulfate, anhydrous cobalt chloride, sodium peroxide, etc.
Anhydrous copper sulfate: originally white, turns blue when in contact with water;
Anhydrous cobalt chloride: originally dark blue, turns pink when in contact with water;
Sodium peroxide: originally light yellow, turns white when in contact with water.
Copper sulfate (CuSO4) is a white or off white powder. Its aqueous solution is weakly acidic and appears blue. The common form of copper sulfate is crystalline, with copper sulfate monohydrate ([Cu (H2O) 4] SO4 · H2O, copper sulfate pentahydrate) as a blue solid (crystal). Its aqueous solution appears blue due to the presence of hydrated copper ions, so anhydrous copper sulfate is often used in the laboratory to test for the presence of water.
Is the water discoloration label toxic?
Water discolored labels are usually non-toxic. This type of label is made of special materials and developed through special processes, which can change color when exposed to water. These materials strictly comply with national laws and regulations on environmental protection and safety during the manufacturing process, and have passed multiple tests including heavy metal, toxicity, solvent residue, etc. The dried printing film is actually non-toxic, and the product formula does not contain any actual toxic ingredients. Therefore, the water color changing label is safe under normal use and will not pose a threat to human health. However, to ensure safety, it is recommended to follow the product instructions and precautions when using.
What are the ingredients of the water color changing label?
The components of the water color changing label mainly include special ink materials, which incorporate chemical substances that change color when exposed to water. Specifically, these chemicals remain stable in a dry state, but when they come into contact with water, they trigger a chemical reaction that causes a color change. This kind of change is usually irreversible and the color change is obvious, making it easy to observe.
However, it should be noted that it is difficult to provide a universal ingredient list as the specific formula and ingredients of the water discoloration label may vary depending on the manufacturer and product. These ink materials are usually carefully designed and tested to ensure their safety, stability, and color changing effect.
During the manufacturing process, these inks will combine with other auxiliary materials such as adhesives, substrates, etc. to form a complete water color changing label. The selection and use of these materials comply with national laws and regulations on environmental protection and safety requirements to ensure the quality and safety of the products.
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