Put them in water.
you can place them in water, and the marbles are denser that plastic beads, so the beads will float.
Put them in water.
Chromatography
I suppose that the manual separation is the most simple method.
6
There are 8/9 black beads and the same amount of white beads in the anime. But in the manga, the beads are RED and white. I don't know if there is the same amount of beads in the manga as there are in the anime.
water marbles are made from the same material as contact lenses
Quantity of beads = 5.13kg or 5,130,000 mg 1 bead = 320 mg 5,130,000/320 = about 16,031 beads 1 marble = 8.58 g 16,031 x 8.58 = about 137,546 g or 137.546 kg
6
Going of weight of real hama beads there should be about 16000 beads but that is only if the weigh the same.
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7
In order for 4 red marbles to be one-third of a group and 3 blue marbles to make up one-fourth of the same group the number has to equal 12.