I have a straight razor tattooed on my right calf. Be aware that some items have certain meanings in the tattoo world and that people may make assumptions based on your art.
A straight razor, for instance, often signifies that the wearer is a rehabilatated drug user or alcoholic. The razor, being straight, symbolises straight edge.
As an ex user my straight razor is surrounded by roses (new life) and has a diamond in the middle (hard, forged by pressure). I'm happy for people who can read the signs to know my past.
Obviously a tattoo is a highly personal thing and what means something to me may mean something totally different to you, but you should be aware that if you get a straight razor tattooed on you, people may assume you were an addict.
'Follow that will and that way which experience confirms to be your own, i.e., the true expression of your individuality'- Carl Jung