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Vanishing jelly marbles amazon.
Just add water and watch these tiny spheres turn into big jelly like marbles.
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It looks like an ordinary glass of water but hiding just below the surface of the water is an amazing collection of large jelly like marbles that become invisible when submerged in water.
There is no reason i can think of why a tub of salt water should suddenly form marbles sodium acetate is the salt used for the famous supersaturation demo in chemistry class where you drip the solution onto a seed crystal and it precipitates out piling up into a tower.
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Then teach a captivating lesson about light and polymer when you hide and then uncover your own secret message.
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In other words they vanish like magic.
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