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What significance do the colours yellow and black have in NW Germany and the Netherlands?

Three or four Eredivisie football (soccer) clubs in southern Netherlands, along with their German neighbours Borussia Dortmund, use the colours yellow and black. Plus, Pittsburgh, with its "Pennsylvania Dutch" heritage, has yellow and black teams (Steelers, Penguins). What is the origin of yellow and black in this region?
in the US it means "caution"

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