The buss bars in the contactor that have the Silver/Cadmium contacts on them.... Yes there's Cadmium in them...
https://en.m.wikipedia.org/wiki/Cadmium_poisoning
The buss bars are normally Copper, often plated with something Silvery, Silver or Nickel, I dunno what.
Use side cutters and nip the bar and then bend and break it there at the nip, it will break and if its Copper you will get a very Reddish colour at the break.
(If you cut it, often the coated metal will smear across the cut and cover the red of the Copper)
Often everything metal in the contactor is Copper coated, often Copper coated Steel parts, but its easy to check with a magnet for Steel.
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Or you can make a link to a site that has your pics.
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