So I have a lil 18650 ego clone mod with a clearomizer (<2ml capacity) on the top. When I bought it, I got some cranberry/pomegranite (red) ejuice as well as some menthol(clear)... They were both from the same place and a 30pg/70vg mix. I also ordered another mint/menthol (clear), which is a 50/50 mix. I am a light vaper (?) and only vape about 1-1.5ml / day, so every day, I have been coming in and putting a new eye dropper of ejuice in the clearomizer to top it off.
Started off with just the red, next day added clear from same place, then added some clear from other place last night... This afternoon, I realized that my juice is brown ...
It still tastes about the same, but wondering ... ... Has anyone else had this or could explain it please?

Thanks in Advance...
Also, any quick tips on cleaning the clearomizer?