Half sleeves are usually just a pit stop on the road to getting a full sleeve. You miss the smell of the ink and vaseline and crave the feel of the needle creating a masterpiece on your skin. People often start with a half sleeve before they decide to complete it and finish the entire thing. They are sometimes viewed as incomplete until the rest of the arm is done. They are easier to cover and you don’t necessarily need a long sleeved shirt to cover them.
SS blood group tattoos (German: Blutgruppentätowierung) were worn by members of the Waffen-SS in Nazi Germany during World War II to identify the individual's blood type. After the war, the tattoo was taken to be prima facie, if not perfect, evidence of being part of the Waffen-SS, leading to potential arrest and prosecution. This led a number of Ex-Waffen-SS to shoot themselves through the arm with a gun, removing the tattoo and leaving scars like the ones resulting from pox inoculation, making the removal less obvious.
Many people start their tattoo sleeves without intent and that's just fine. If you take the organic approach and let one small tattoo turn into another and somehow tie it all together with a background of some sort later, you'll likely have an armful of meaningful body art. Others go full on with a sleeve from the get-go and that works too. Of course, with this approach, you'll be investing a larger sum of money upfront, and you'll need to dedicate the time in the chair to complete the work. Most likely you'll be going back to the same artist which means their schedule will need to be considered as well. If you have the time and the money to complete the job, get it done. Otherwise start a slower and more balanced approach. Never compromise quality for quantity.
According to George Orwell, coal miners could develop characteristic tattoos owing to coal dust getting into wounds. This can also occur with substances like gunpowder. Similarly, a traumatic tattoo occurs when a substance such as asphalt is rubbed into a wound as the result of some kind of accident or trauma. These are particularly difficult to remove as they tend to be spread across several layers of skin, and scarring or permanent discoloration is almost unavoidable depending on the location. An amalgam tattoo is when amalgam particles are implanted in to the soft tissues of the mouth, usually the gums, during dental filling placement or removal. Another example of such accidental tattoos is the result of a deliberate or accidental stabbing with a pencil or pen, leaving graphite or ink beneath the skin.