I assume that the red color clearly has a positive effect on the magnets, because I can not imagine that it is precisely the red holder received Magnets from another production. My study of physics is indeed now really over twenty years ago, I can not remember ever having seen optical and magnetic effects combined. Maybe the Times would be a topic for a dissertation. And with the price of the holder, one can quite a few times in different colors order to investigate the influence of color on the magnetic adhesive effect can.
But maybe it's on the refrigerator of users. In my short experiments (I wanted to not investigate scientifically, but only a pen holder for the refrigerator to buy), I noticed that the holder on the refrigerator with stainless steel front really adhered well, but unfolded almost no adhesion to the IKEA kitchen fronts. Spurred on by this quite interesting effect, I had tried some other surfaces: watering, laundry basket, LED TVs, DECT handset, etc., each with varying degrees of success. Perhaps we should here a buyer of other colors again transmit a result, if these adhere better example of the kitchen cabinetry than the red.
My Conclusion:
+ Keeps well on the fridge
+ Plenty of space for pens
- Less suitable for other surfaces
