Regards to all the forum a special greeting for patnor, that I am aware that it is difficult to work with hcl / cl ic chips but this is a test, and I know that I have lost some value as undissolved material in the dust will collect a few months and then I get HNO3, and I want to mention that I threw chips so far ie. left on the plates considering them with little vrrijednosti therefore do this test with hcl / cl today I washed the dust harold method and re-dissolved in HCl / CL and I will tomorrow when excess chlorine evaporates again to add SMB, note I use potassiummetabisulfite (K2S2O5) I think there is no difference of natrijummetabisulfit (Na2S2O5) here is a picture of the re-dissolving dust