When this first arrived, I was really impressed, but now time has passed and I've discovered a problem. The "water" (or whatever liquid the ferrofluid is suspended in) is not sterile. This means that over time it has become discolored and looks slightly unpleasant now. Imagine keeping a bottle of water for a few months... the inside of the bottle has developed a brown tinge and a algae is growing inside. I've not researched if it is possible to swap the liquid, but keep in mind if you purchase that it might be best to keep it out of the sunlight to limit the speed at which the algae can grow.

When this first arrived, I was really impressed, but now time has passed and I've discovered a problem. The "water" (or whatever liquid the ferrofluid is suspended in) is not sterile. This means that over time it has become discolored and looks slightly unpleasant now. Imagine keeping a bottle of water for a few months... the inside of the bottle has developed a brown tinge and a algae is growing inside. I've not researched if it is possible to swap the liquid, but keep in mind if you purchase that it might be best to keep it out of the sunlight to limit the speed at which the algae can grow.

When this first arrived, I was really impressed, but now time has passed and I've discovered a problem. The "water" (or whatever liquid the ferrofluid is suspended in) is not sterile. This means that over time it has become discolored and looks slightly unpleasant now. Imagine keeping a bottle of water for a few months... the inside of the bottle has developed a brown tinge and a algae is growing inside. I've not researched if it is possible to swap the liquid, but keep in mind if you purchase that it might be best to keep it out of the sunlight to limit the speed at which the algae can grow.

This toy is amazing. It comes with two neodimium magnets so you can play with ferrofluid in many ways. The bottle was very well packaged and banggood adds extra foam protection so it have arrived in perfect condition. A surprising present for science freaks. Este juguete es fantástico. Viene con dos imanes de neodimio que permiten interactuar con el ferrofluido de muchas maneras. El envío va muy protegido y banggood lo manda envuelto en foam con lo que llego en perfectas condiciones. Un sorprendente regalo para los amantes de la ciencia.

This toy is amazing. It comes with two neodimium magnets so you can play with ferrofluid in many ways. The bottle was very well packaged and banggood adds extra foam protection so it have arrived in perfect condition. A surprising present for science freaks. Este juguete es fantástico. Viene con dos imanes de neodimio que permiten interactuar con el ferrofluido de muchas maneras. El envío va muy protegido y banggood lo manda envuelto en foam con lo que llego en perfectas condiciones. Un sorprendente regalo para los amantes de la ciencia.

This toy is amazing. It comes with two neodimium magnets so you can play with ferrofluid in many ways. The bottle was very well packaged and banggood adds extra foam protection so it have arrived in perfect condition. A surprising present for science freaks. Este juguete es fantástico. Viene con dos imanes de neodimio que permiten interactuar con el ferrofluido de muchas maneras. El envío va muy protegido y banggood lo manda envuelto en foam con lo que llego en perfectas condiciones. Un sorprendente regalo para los amantes de la ciencia.