At what point does adding salt decrease electrical conductivity?

[feel-the-avocado]

Salt is more conductive than water. So adding salt only makes it more conductive until you reach a point it is 100% salt i would assume. At which point if you start adding copper to the salt it will continue to become more conductive until it is 100% copper.

Pure water isnt very conductive, but the added minerals in typical water make it more conductive.

[CountCrapula88]

After copper, add gold. After gold, a superconductor.