Many apologies for being "that guy", I must correct you sir. Per Scottish law (yes, actual LEGAL DOCUMENTS) Scotch may contain only three things:
1) water
2) yeast
3) barley
Scotch must also be aged in oak barrels. No other wood is allowed.
Should any of the above not be met then the spirit is not allowed to be called Scotch, but must be called whiskey or some other derivative.
Otherwise nice amount of information.
Cheers
M.
It is also permissable to add E150 (caramel) colouring. Many whisky purists, me included, would rather this was not the case.