I'm sure they would have amazing half-life periods. Like a couple of thousand years? Eat your heart out Elixir!
Of course the industry will never make them because they could only sell one set for one bass and never have a repeat customer.
Sure they would. They would come out with coated uranium strings, then after that market is saturated, color coatings would follow. There will always be customers who will have to try out the latest fad.
