Serial numbers were used to track the thousands of prisoners arriving at concentration camps each day. Serial numbers were only tattooed in one place, at Auschwitz. Prisoners received a tattoo if they were deemed fit for work. Those who were chosen for death were not tattooed. The serial number was located on the left outer forearm. A single needle was used to pierce the prisoners' skin and left a permanent mark of their number. Upon arrival, the prisoners' clothing and personal belongings were confiscated and replaced with a striped uniform, also known as "striped pajamas." Prisoners were given leather or wooden shoes without socks, which hurt their feet. It would rub against their ankles, also causing pain. It was also dangerous due to the polluted environment they were confined in, with their exposed feet potentially leading to infection or even death. The serial number was sewn onto these uniforms with a colored triangle indicating the reason for their presence in the camps. Men and women were given similar, but different, clothing. Women wore a striped dress while men wore a hat, vest, coat and pants. Changing uniforms every six weeks made these clothes very dirty; The Jews worked there, carrying out intense and difficult work. The Nazis also used color-coded symbols to label prisoners based on the reason for their imprisonment. Homosexuals were labeled pink, criminals had a green triangle, antisocials were marked with a black triangle, political prisoners were marked red, and Jehovah's Witnesses were marked with a purple triangle. Being marked with a yellow triangle was a common way of showing that one was Jewish. Sometimes a yellow triangle and a r...... middle of paper ......many medical criminals. The Jews already had an unbearable life, but the experiments that took place were not only inhumane, but also purely evil, as very few patients survived these horrible events. Those who did left permanent injuries. "The piles get bigger. Suitcases, packages, blankets, coats, handbags which open as they fall, spilling out coins, gold, watches; mountains of bread pile up at the exits, piles of marmalade, jams, masses of meat, sausages spilled on the gravel; trucks loaded with people set off with a deafening roar and move away amid the moans and cries of women separated from their children. and the stunned silence of the men who remained there. They are the ones who received the order to move towards the right, the healthy and the young who will go to the camp, they too will not escape death, but they must. 'first work....' - Borowski