thanks Goldsilverpro,i asked about zn,or mg,because i find some dificulties in eliminating excess zinc powder after the precipitation of Rh from the spent plating solution----the zinc follows the semi pure Rh sponge--- When i produce a new rhsulfate plating solution,i discovered ,zinc impurities in the bath----and had to clean the bath using potassium ferrocianide to precipitate this zin out---I obtained some magnessium thin metals leafs,and will try to cement the rhodium with it---That was the reason why i asked for help in my thread==After i do the cementation wit mg,i will tell you the results and hope that it works
Regards,i after 5years (retired) decided to come back and will sometimes need your help---i learned a lot with your know-how and experience
Arthur Kierski