The seal band tested out of curiosity shows how great degradation can be caused by a bad coating. Some people have written about how they have had some amazing results with lower inductance toroids with a much lower resistance value which obviously increases power. This current level indicates where inductance can be expected to fall considerably if the DC bias stream is further increased. But it is that hysteresis wallpaper is the dominant core wallpaper up to a frequency determined by the capacity of the core. Induction temperature is dependent on hot air and radiation transmission of heat. The sealing tape tested out of curiosity shows just how great a degradation can be caused by a poor coating.Some people have written about how they have had some fantastic results with lower inductance toroids with a far lower resistance value which obviously boosts power.This current level indicates where the inductance can be expected to drop significantly if the DC bias current is increased further.However it is found that the hysteresis loss is the dominant core loss up to a frequency determined by the performance of the core.The inductor temperature is dependent on the convective and radiative transfer of heat.