The FDA regularly issues warnings to consumers about avoiding any temporary tattoos labeled as black henna or pre-mixed henna as these may contain potentially harmful ingredients including silver nitrate, carmine, pyrogallol, disperse orange dye and chromium. Black henna gets its color from paraphenylenediamine (PPD), a textile dye approved by the FDA for human use only in hair coloring. In Canada, the use of PPD on the skin, including hair dye, is banned. Research has linked these and other ingredients to a range of health problems including allergic reactions, chronic inflammatory reactions, and late-onset allergic reactions to related clothing and hairdressing dyes. They can cause these reactions long after application. Neither black henna nor pre-mixed henna are approved for cosmetic use by the FDA.
Each militarybranch has their own restrictions pertaining to tattoos. As of April 2007, the United States Marines Corp. banned tattoo sleeves except for those already grandfathered in prior to the policy change. If you plan on enlisting you can forget tattoo sleeves for now. This consideration must also be made for employment. Potential employers may have regulations banning sleeve tattoos or any visible tattoos for that matter. If you must stay sheathed from shoulder to wrist, you'll be hot in the summer.
The Japanese word irezumi means "insertion of ink" and can mean tattoos using tebori, the traditional Japanese hand method, a Western-style machine or any method of tattooing using insertion of ink. The most common word used for traditional Japanese tattoo designs is horimono. Japanese may use the word tattoo to mean non-Japanese styles of tattooing.