They look nice but It does not say what the material under the gold plating is. And that goes back to my question of how much thermal EMF effect can the plating have at such thin layers and no one seems interested in discussing that topic
When looking at the offered price, I guess it is probably not a special "low emf" material.
About plating I am still very interested and made some more experiments with pure copper, copper-silver, copper-tin and copper-gold.
I was quite surpised, that tin plating does not seem to be bad at all, therefore I odered some tinned spade lugs and cables. But I have not found any Seebeck numbers on copper-tin, so if anyone finds some, please share.
Just to see how nickel plating will be, I also ordered special high temp cables.
As soon as I get these I can give an update if there is interest.
I also made an experiment with making my own crimp spade lugs out of pure copper (but failed so far).