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Everything fine except that after a while, there'll be an air bubble in the water. It'll keep expanding and when your ferro fluid got inside that bubble, it'll remain inside the bubble.
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The product came within the estimated delivery time, regardless of it taking over 2 weeks, therefore gave it the three starts. You think after having to wait so long for a product it would arrive in a useable state, however it arrived broken! This was meant to be a gift and of course I was never able to give it so have no idea if it does what it is supposed to. Would not recommend at all
Verified purchase: Yes | Condition: New