what is the most hardest cheese to make and why and does it have any artificial things in it????

Question: what is the most hardest cheese to make and why and does it have any artificial things in it????
- Keywords:
  artificial,
  cheese,
  cheese making
Asked by rosieyolo2013 to Julie on 12 Mar 2013.
- Julie Bland answered on 12 Mar 2013:
  
  Hardest cheese I guess would be swiss cheese like tete de moine. No at least in the EU you are not allowed to put anything artificial or it is not called cheese anymore but cheese substitute! Cheese can only be made from bacteria, enzyme, milk and salt and sometime you can add fruit, herbes or spices.

Question: what is the most hardest cheese to make and why and does it have any artificial things in it????