Abstract: A method for checking the coercive field strength of magnetic pigments of an areal sample which are contained in a magnetic region of the areal sample includes: after a magnetization of the areal sample until saturation, a first partial counter-magnetization of the magnetic pigments out by a magnetizing device, and a first measurement of a first magnetization value of the partially counter-magnetized magnetic pigments are carried out. The measured magnetization values are transmitted from the measuring device to a checking device. The checking device checks the magnetization values of the partially counter-magnetized magnetic pigments for ascertaining a check result that relates to the coercive field strength of the magnetic pigments and transmits the check result relating to the coercive field strength to an output device connected to the checking device.