All gas is colourless but can you name any that have a colour and are any of them from the body

Question: All gas is colourless but can you name any that have a colour and are any of them from the body
- Keywords:
  gas
Asked by jess10amy to Liam on 18 Jun 2013.
- Liam Bagley answered on 18 Jun 2013:
  
  Hi Jess10amy,
  
  I seem to remember that chlorine is slightly green I think? Because it absorbs wavelengths of light!
  However I do not know of any gases in a human which we can see. The movies get it wrong sadly when people have stink lines coming off them and pumps are green!
  
  Liam

Question: All gas is colourless but can you name any that have a colour and are any of them from the body