What causes plastic tanks to clowd or crack?

[Screamin Eagle]

I think most of us have seen the lists of the juices that can clowd or crack a plastic tank. But what I would like to know is if anyone out there knows what it is that is in those "tank cracker" juices that does the cracking (or clowding)? Is it juices that are high in citric acid? Or would they contain some kind of naturial solvent that the plastic just doesn't like?
Is it a number of different reasons, or do they all shair something in common (other then their ability to do damage to your tank)?

 

[Screamin Eagle]

Did I actually ask a question that no one on ECF knows the answer to?

 

[carynjahn]

I've heard that the citric acid is corrosive and causes issues as well as the oil content used in the cinnamon flavoring. Sorry, i don't have a beyter answer than that!

 

[ephemerata]

It depends on the flavoring. Here's a decent article on why it may occur. Besides ketones and citric acid being likely culprits, cinnamon is probably derived from cinnamon essential oil, and essential oils are typically volatile.

 

[Ms.Kitty]

I've had a few to start clouding too.
I'm curious....