The air in the gap will gradually be replaced by moisture, so that the interior of the water-made jade is full of moisture. According to the inquiry of Jewelry Network, water foam jade is a decorative material, also known as foam pearl jade. Cotton will appear when the jade is soaked in water, which is caused by the internal structure and material characteristics of the jade. Because of its porous fiber structure, when it is soaked in water, the air in the gap will be gradually replaced by water, so that the jade is filled with water. This kind of water filling will lead to the gradual narrowing of the gap between the particles of water foam jade, and the water will evaporate to form pressure. When external pressure is applied, water will be forced out of the internal channel, similar to compressing water in a sponge. Therefore, when external pressure is applied, the water in the foam jade soaked in water will be compressed and squeezed out, thus showing a phenomenon similar to cotton seedling emergence.