"Blue blood" is a term from medieval Europe. People believed that royalty and nobility had blue blood. The elite had enough power and wealth that they could afford to have peasants and the urban poor do their dirty work for them. Since the aristocrats were able to stay inside and avoid long hours in the fields (and the sunlight), they were often so pale that their blue veins showed under their translucent skin, thus leading people to believe that their blood was blue.
Additionally, the daily use of silver forks, spoons, knives, drinking goblets, plates, etc. by the Royal families and nobility caused the condition of Argyria, which literally turned skin blue and developed rather pronounced blue veins and arteries.
Scientists now know that the very high use of silver eating and drinking conveyances means that there was a very high transfer of ionic and colloidal silver mixed into the alkaline and acidic foods. Most directly the silver wine goblet could leach 100s of parts per million of silver in the wine.
Read more about Dutch nobility here. In short: Dutch nobility virtually expired after
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