Word meaning the opposite of "golden"?
Solution 1:
All these are relatively modern figurative uses of golden in specific circumstances. So each circumstance has a metaphor meaning the opposite, but without a common colour or metal theme.
I don’t think you’ll find a colour that conveys an opposite meaning. Black is probably the nearest and most common , but is used in different circumstances and is a better opposite to white.
As for a metal, lead is probably best, as it’s what you (or the alchemists) would wish to turn into gold. But, more than minimal worth, it is associated with weight (a leaden silence).
So as opposite to “golden handshake”, one might say “given the boot”.
A more literary opposite to a “golden ticket” would be to “draw the queen of spades”.
I don’t know about golden samples. Somebody should have stirred the pudding more.
(Ironically, in contrast to a golden handshake, a gold watch would nowadays appear as a very meagre “severance package”. )