The form of the crucibles has varied through [[time]], with designs [[reflecting]] the [[process]] for which they are used, as well as regional variation.The crucible helps to prevent the [[heat]] from affecting the solution. The earliest crucible forms derive from the sixth/fifth millennium B.C. in Eastern Europe and Iran. | The form of the crucibles has varied through [[time]], with designs [[reflecting]] the [[process]] for which they are used, as well as regional variation.The crucible helps to prevent the [[heat]] from affecting the solution. The earliest crucible forms derive from the sixth/fifth millennium B.C. in Eastern Europe and Iran. |