Just compare the weight of the beads. In fact, if a rudraksha bead sinks, it seems to have a higher weight and is therefore often considered more efficient. Perhaps I mentioned that most modern people understand that if a rudraksha sinks, it is considered a normal rudraksha. So they shop for the rudraksha and the leader and other high-intensity objects. The density cause the rudraksha to sink faster.
about the color of the water. It looks like the rudraksha you bought should be the same color and color as the water. It is the custom of Rudraksha shoppers to dip Rudrakshi or Rudraksha beads in food coloring to make the Rudraksha bead yellow, orange or red. Such colors are especially attractive to educated customers. However, these colors fade over time because they are not permanent in nature. In fact, I strongly advise you not to buy any colored rudraksha or japamala because the mani is also designed to hide any imperfections. The crack can be a hole or a hole or an insect infestation, which can be filled with paint. That may change over time.