If the skin foods burn (I have never experienced this) - I'd like to warn you against alum.

Limes vs. Coral - it's obviously personal. I cannot tell you what to like, it's your nose, etc. To me limes has something detergent - artificial in it. My wife also doesn't like it. But what can I say, some people like the scent of gasoline too. My top two scents have been described on basenotes as "burn rubber" and "pencil shavings"

Cheers
Ivo