Nickel crucibles are suitable for fusions, including those using sodium peroxide. In analytical laboratories, nickel crucibles offer high resistance to dilute alkalies at a very low cost per crucible. In some instances, nickel crucibles are preferable to zirconium. Life expectancy of a nickel crucible is from 4 to 6 fusions. They present an advantage, other than cost, when small amounts of zirconium are present, or if its removal with mandelic acid is unsuccessful.