If fine materials (such as zinc, magnesium carbonate) are present, it will cause more shrinkage and compaction during drying.
Use of calcined zinc, artificial bone ash or any other source of calcium,
Try talc or dolomite to replace magnesium oxide with magnesium carbonate.
It is natural to see 20% of pottery soil in pottery.
If there is a significant amount more than this, try to use soils that have less ductility.
You may have to do some calculations to make these corrections.
Finally, you need to measure the content of the glazed soil to achieve a medium of suitable hardness and a minimum of shrinkage and shrinkage.
