Local conditions influencing the state of museum specimens set the frame for possible methods of treatment. In Denmark these conditions have determined the use of conservation methods involving heating procedures and electrolytic treatments of archaeological and historical iron. The history of conservation methods applied and developed from 1898 until today is described and their usefulness is discussed. This leads to the conclusion that heating methods are indispensable for certain categories of iron objects, but that modifications and entirely new ways are needed. Gaseous and liquid reduction methods are especially favored. Some possible solutions are suggested, e.g. hydrogen reduction, plasma reduction, electrolytic reduction and sulfite reduction. The use of inhibitors is also taken into consideration.