Has been for 30+ years.
They have a roll of shrink tube with a "- - - - -" stripe to mark the negative leg. Often with a fat stripe so a wrong-way cap will stand-out on quick inspection of board.
I do not know why draftsmen mark "+" and cap makers mark "-". But we should be able to figure it out.
I think Nigel was talking about the silkscreen on the first board posted The curved white stripe next to one pin for the electro caps....
Tony.
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