UV marking pens take the form of thick wax crayons, similar to felt-tip pens. They are used to mark the desired position; the mark is then pressed or ironed with a warm iron so that the wax melts and diffuses into the cloth. After this, the mark is no longer visible to the eye.
Suitable fabrics
UV marking pens can only be used on wool and wool-blend fabrics, because the wax must be absorbed by the fibres – and wool does this best. If such UV preparations were applied to pure cotton or pure polyester fabrics, a stain would inevitably remain after pressing.
