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Hitler believed that the pure German people, the Aryans, were the master race. Hitler said that one of the reasons that Germany lost the First World War was that the German race had been weakened through Aryans marrying non-Aryans.Therefore if Germany was to become strong again, the Nazis had to ensure the purity of the Aryan race. This view of Germans as the master race was encouraged by the use of healthy, 'pure' Aryans in Nazi propaganda posters.The Aryan race is tall, longlegged,slim The race isnarrow-faced, with a narrowforehead, a narrow high-built nose and a lower jawand prominent chin, the skinis rosy bright and the bloodshines through .... the hair issmooth, straight or wavy -possibly curly in childhood.The colour is blond.Description of a 'pure'Aryan. From a leaflet 'TheNazi Race', 1929.
If you have naturally dark skin, there is no way to lighten it naturally other than always wear sunscreen and avoid sun exposure. If you have light skin and just want to make it lighter, you just do the same. There is no natural magic skin whitening potion.