I don't think so.
They have been collected, sold, cut, coloured, and stabilized for years. I certainly have some and have used a lot in the past. I believe the salt has more often affected the mammoth ivory but even then I have used a lot of that too that's been good. Yes, I did end up throwing some out that was nothing but fine layers. The last piece I bought that came from the North Sea I have as a specimen mounted on a wire frame I made. It's mega colours with orange, black, browns, and blues. I could see it would fall apart if I tried to cut it for scales so I mounted it instead. My special small folder has some similar for scales and meteorite bolsters as well.
Frank