In wet processing, either boiling water or steam is added to the material, causing fat to rise to the surface; in dry processing, fat is released by dehydrating the raw material.
Either boiling water is added to the material. This was in wet processing. Steam is added to the material. This was in wet processing. Either boiling water was causing fat to rise to the surface. This was in wet processing. Steam was causing fat to rise to the surface. This was in wet processing. Fat is released by dehydrating the raw material. This was in dry processing.