Clear ejuice turning brown?

[Vap4que]

So I'm vaping some clear Watermelon 50/50 juice in a AGA W and when I get to the last ml it turns dark brown?

is this normal?

 

[DHCrocks]

yeah, I use the same flavor and it darkens. it's just the sugars caramelizing and getting concentrated as the liquid gets used up.

 

[Caridwen]

Yes, it's fairly common.

 

[Digame]

Take some mild flavored (non sweetened) tobacco e-juice and add it. It breaks it up a bit and you get some more puffs out of it.