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"Initially, the SS authorities marked prisoners who were in the infirmary or who were to be executed with their camp serial number across the chest with indelible ink. As prisoners were executed or died in other ways, their clothing bearing the camp serial number was removed. Given the mortality rate at the camp and practice of removing clothing, there was no way to identify the bodies after the clothing was removed. Hence, the SS authorities introduced the practice of tattooing in order to identify the bodies of registered prisoners who had died."
https://encyclopedia.ushmm.org/content/en/article/tattoos-and-numbers-the-system-of-identifying-prisoners-at-auschwitz
