I used this for fun but the bottle was only 2/3 full and after a day it wasn't very magnetic and lost some of the spikes it had! Not that he had much to start with! It is also a very small bottle so when it was only 2/3 full hardly any ferrofluid was used! This is really not a very good product. It was almost gone and wasn't very magnetic and lost most of its magnetism in just a day and was gradually losing more!
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