Dehydration removes the specimen fluid, as well as some fat. In this step tissue fluid is replaced with an organic solvent. Either alcohol or acetone may be used as a dehydrant for Plastination. Acetone is used in most cases because acetone also serves as the intermediary solvent during the next step - forced impregnation. To minimize specimen shrinkage, dehydration is done in cold (- 15 ° C to 25 ° C) acetone. If the removal of fat is also desired the dehydrated specimen must be kept in acetone at room temperature for some time. An acetone amount of 10 times the specimen weight is best for good results. Dehydration is finished when the water content is less than 1 %.