2. Pure cotton cloth absorbs water very well. Put some water in the pure cotton cloth and then squeeze the water dry by hand. If the water keeps squeezing, it is not pure cotton. If it is pure cotton, it will show special wrinkles after squeezing.
3. Take out a small yarn from the hem of the clothes for fire detection. Real natural cotton fibers will not shrink when burning, but will produce a natural yellow flame like paper, and at the same time, it will produce the smell of burning paper, and after burning, it will produce gray ashes that can be crushed; Chemical fiber will melt and drip when burning, there will be black smoke and burning glue, and burning will form black hard spots.
Extended data
Characteristics of pure cotton clothes:
1, thermal insulation:
Because cotton fiber is a poor conductor of heat and electricity, the thermal conductivity is extremely low, and because cotton fiber itself has the advantages of porosity and high elasticity, a lot of air can be accumulated between fibers, and air is also a poor conductor of heat and electricity, so cotton fiber textiles have good thermal insulation performance, and wearing pure cotton clothes makes people feel warm.
2. Heat resistance:
Pure cotton fabric has good heat resistance. When the temperature is lower than 1 10℃, only the moisture on the fabric will evaporate, and the fiber will not be damaged. Therefore, the pure cotton fabric has no influence on the wearing, washing, printing and dyeing of the fabric at room temperature, thus improving the washing resistance and wear resistance of the pure cotton fabric.
3, alkali resistance:
Cotton fiber has strong alkali resistance. Cotton fiber will not be damaged when it is in alkaline solution. This property is conducive to washing away pollution, disinfection and impurity removal after taking. At the same time, cotton textiles can be dyed, printed and processed to produce more new cotton varieties.