The method for separating shells from other mineral matter has been well known for many years. This method is primarily based on the fact that empty shells are filled with air and therefore float on the water surface, whereas other mineral matter sinks. However, in mires, this method is not optimal. In such environments, empty shells become filled with water, causing both empty shells and living animals to sink during the wet sieving process. The present method is designed based on this principle.
No takes yet. Share an insight, caveat, or question.
Michal Horsák (2003) studied this question.