| abstract |
IN WHICH N 1, 2 OR 3 AND R1 and R2 represent hydrogen, alkyl, or combined represent a ring system. An electroplating bath for depositing lustrous tin which bath contains bivalent tin ions, sulphate, sulphonate, sulphamate or fluoborate anions, a surface-active substance, a lustering agent of an unsaturated character having aldehyde or ketone groups and a compound of the type |