What is the principle of a towel that will undress?
Is the cause of heat, that is, sensitive to heat.
Generally it is patterned with a layer of heat sensitive materials on the towel surface, the general state of this material is transparent, temperature changes will appear originally did not show a pattern or color change feeling when heated.
Because the color change layer is on the surface of the towel pattern, this kind of substance must have an effect on the body. Don't use it.
