Serial numbers were used to keep track of the thousands of prisoners arriving at the concentration camps every day. Serial numbers were only tattooed in one place, Auschwitz. Prisoners were tattooed if deemed fit for work. Those who were chosen for death were not given a tattoo. The serial number was located on the outer left forearm. A single needle was used to pierce the prisoners' skin and leave a permanent mark of their number. Upon arrival, prisoners' clothes and personal effects were confiscated and replaced with a striped uniform, also known as "striped pajamas". Prisoners were given leather or wooden shoes without socks, which caused their feet to hurt. It would rub against their ankles, also causing pain. This was also dangerous due to the polluted environment they were confined in, their exposed feet could cause infection or even death. The serial number was sewn onto these uniforms along with a color-coded triangle showing the reason for their presence in the camps. Men and women were provided with similar, but different, items of clothing. The women wore a striped dress while the men wore a hat, waistcoat, coat and trousers. Changing uniforms every six weeks made these clothes very dirty; The Jews worked in these carrying out intense and difficult jobs. The Nazis also used color-coded symbols to label prisoners based on the reasoning that justified imprisonment. Homosexuals were labeled pink, criminals had a green triangle, antisocials were marked with a black triangle, political prisoners were red, and Jehovah's Witnesses were marked with a purple triangle. Being marked with a yellow triangle was a common way to prove that one was Jewish. Sometimes a yellow triangle and an R... in the center of the card... numerous medical criminals. The Jews already had an unbearable life, but the experiments that were conducted were not only inhumane, but they were pure evil, as very few patients survived these horrific events. Whoever did so suffered permanent injuries." The piles grow. Suitcases, bundles, blankets, coats, bags that open when falling, spilling coins, gold, watches; mountains of bread accumulate at the exits, piles of jam, jams, masses of meat, sausages; sugar scattered on the gravel. The trucks, loaded with people, leave with a deafening roar and move away amidst the moans and screams of the women separated from their children, and the stunned silence of the men left behind they were ordered to move to the right, the healthy and young people who will go to the camp. In the end, they too will not escape death, but first they will have to work...” - Borowski