Hello. Thank to the contribution of Dan Kemppainen and Herbert Poetzl, I had the opportunity to test more alloys. As before, a really low EMF (< 2uV/K) hasn't been identified. Measurements have been done between water ice point and boiling point with Agilent 34401A. I don't expect the curves be linear, but here it's assumed they are. Copper - Sn96.5/Ag3/Cu0.5 -> 3.35uV/K Copper - Sn95.5/Ag3.8/Cu0.7 -> 3.22uV/K Copper - Sn60/Pb40 -> 3.34uV/K Copper - Pb92.5/Sn5/Ag2.5 -> 3.02uV/K Copper - Sn99.3/Cu0.7 -> 3.43uV/K Copper - Sn96/Ag4 -> 3.33uV/K Copper - Sn42/Bi57.6/Ag0.4 -> 4.43uV/K (thanks to Herbert) Copper - Sn100C (Sn-Cu-Ni+Ge) -> 3.45uV/K (thanks to Dan) Copper - Brass -> 3.30uV/K The best one keeps to be the Pb92.5/Sn5/Ag2.5, the best between the lead free ones is the Sn95.5/Ag3.8/Cu0.7. If someone has other alloys to suggest me to test I'll be happy to do it (I have just ordered the Sn97/Cu3 to see if higher copper content is relevant). I'll be very happy to pass all the samples to a fellow who wish to repeat the experiment, provide that he/she will post results here and in turn, will pass everything to the second one who will do the same. Andrea