magnetic properties influence (or do not influence) the Casimir force. It would be more interesting, however, to experimentally verify both options (i.e., that the magnetic properties influence or do not influence the Casimir force and that the Drude or, alternatively, the plasma model approach is adequate for the description of the thermal Casimir force). In this case the exclusion of the Drude model in the experiments [30, 31, 46, 58] would be independently verified. This aim, however, cannot be achieved in one experiment with magnetic materials because, as was mentioned in Sec. III, the dashed lines in Fig. 2(a,b) are very close to the respective solid lines in Fig. 1(a,b). This means that the role of magnetic effects in the Drude model description nearly fully compencates differences between the theoretical predictions using the Drude and the plasma model with magnetic effects disregarded. Similar situation holds for Figs. 3 and 4. For the sake of definiteness, we discuss below the experiments with Co plates. Let the result of the measurement of the Casimir pressure between two Co plates be consistent with the solid line in Fig. 1(b) and the dashed line in Fig. 2(b). This would mean that either the metal of the bodies is described by the Drude model and magnetic properties influence the Casimir pressure or, alternatively, the metal is described by the plasma model and its magnetic properties do not influence the Casimir interaction. To choose between these two alternatives, a second experiment is required. Let us consider the so-called patterned plate one half of which is made of ferromagnetic metal (Co) and the other half of nonmagnetic metal (Au). Let a sphere coated with ferromagnetic metal (Co) oscillate in the horizontal direction above different regions of the plate. Thus, the sphere is subject to the difference Casimir force, which can be measured using the static or dynamic techniques [77, 78]. If the first alternative is correct, there is a measurable decrease of the force magnitude when the sphere is moved from Co to Au, because the magnitude of the free energy shown as the solid line in Fig. 1(a) is larger than in Fig. 5(a) (remind that the force in a sphere-plate configuration is proportional to the free energy between two parallel plates). If, however, the second alternative is correct, the difference force when the sphere moves from the Co to Au regions takes the opposite sign. This is because ω$_{p,}$$_{Au}$ > ω$_{p,}$$_{Co}$ and the dashed line in Fig. 2(a) lies lower that the dashed line in Fig. 6(a) (if the ferromagnetic and nonmagnetic metals were selected in such a way that their plasma frequencies would be equal, the difference Casimir force vanishes). Let now the results of the measurement of the Casimir pressure between two plates coated 25