Yes, in Angiers book there are many recipies, Ammonium Chloride, Mercuric Chloride, Ferric chloride are all common ingredients, they promote rusting with a vengeance, Other ingredients can & have been used. Its the old slow rusting process. Not worth making your own as some of the chemicals will be hard to obtain. Ferric chloride was often used in schools for PCB etching, We had a big tub of the granules where i used to work, should have had some!