- In order to remove oxide layers (corrosion) and for deoxidizing purposes where the surface has to meet no optical requirements, the Alfinal product line is used, including, for example, Alfinal 204. Additives for the etching bath, such as Steinex 22, are also available as well as special dye cleaning products. For decorative etchings (long-life etching) the products of the Alfisatin line are used. Alfisatin 357 is unique and especially developed for the high requirements of the aluminium market. Surface irregularities due to special alloy compositions are safely and permanently prevented. Its foaming and draining performance and stability of the bath are further advantages of Alfisatin 357.