That is not a good test.

Reducing the coefficient of friction only means that if there is a force, it is less than the force required to keep the magnet from falling off without friction.

Let me give you an example.

Lets say the vaccines magnetic effect is real. Lets say it provides 0.25N of force.

Lets say the magnet weighs 50g, requiring 0.5N of force to counter gravity.

Lets say the coefficient of static friction is enough to provide 0.25N of force.

Adding talcum powder to reduce the frictional force only proves that the force is not strong enough to hold up 50g. It doesn't prove there is no force at all.

Honestly, I think the best way is to clean two spots with rubbing alcohol or soap and water and test both spots. This will take away oils and make it so the CoF is approximately the same in both spots.

You can also tell by feel if there is a magnetic field. You can feel the 1/r cubedness of it. (You can feel it get stronger as it approaches the spot, even if it is a small effect).

That is not a good test.

Reducing the coefficient of friction only means that if there is a force, it is less than the force required to keep the magnet from falling off without friction.

Let me give you an example.

Lets say the vaccines magnetic effect is real. Lets say it provides 0.25N of force.

Lets say the magnet weighs 50g, requiring 0.5N of force to counter gravity.

Lets say the coefficient of static friction is enough to provide 0.25N of force.

Adding talcum powder to reduce the frictional force only proves that the force is not strong enough to hold up 50g. It doesn't prove there is no force at all.

Honestly, I think the best way is to clean two spots with rubbing alcohol or soap and water and test both spots. This will take away oils and make it so the CoF is approximately the same in both spots.

You can also tell if there is a magnetic force. You can feel the 1/r cubedness of it. (You can feel it get stronger as it approaches the spot, even if it is a small effect).