Desiccation - the removal of water, e.g. dehydration.
A three tiered skill available at:
With Desiccation 1, 25 sulfur can be made from 25 sulphurous water by boiling it in a kettle, as for potash. This does not require additional water. Sulfur can also still be made by evaporating sulfurous water in a tub.
With Desiccation 2, 3 salt can be made from 25 coconut water by boiling it in a kettle, as for potash and sulfur. This does not require additional water.
With Desiccation 3, 3 acid can be made from 1 salt and 25 sulphurous water in a kettle, as for potash, sulfur, and salt. This does not require additional water.