I've been doing the DIY E-Juice a while now. A couple of years. The Nicotein, PG and VG is clear liquid but the flavorings all have coloring added. I've used TFA, Capella, Flavor West, Flavour Art, and a few others. Just about all of them have color. The problem is that this stuff stains my teeth something fierce. So, my question is? Are there flavorings that use no food coloring? Thanks guys.