Yeah, what he saidIf, upon shaking a flavoring with the VG or PG base, the mix turns milky, then something in the flavoring simply is not soluble in the base (or alternately, something in the flavoring is attacking the bottle and that material is insoluble in the VG or PG).
I really like the teaberry flavor. When looking into DIY, the guides for the Lorann flavor marked it as a semi soluble. Their flavoring agent contains an oil that mixes well enough with pg/vg that it can be vaped. Cracks tanks like crazy. Turns milky while when I shake the bottle. Behaves just like what you're seeing with the cinnamon flavor.
As far as the yellow color you're getting, that's simply the natural color of the cinnamon oil. If you've ever bought raw cinnamon, the bark, you'd know it's a brown tree bark. The oil within the bark is yellow. When you get the colloidal suspension of the oil in VG its color becomes very pronounced because you've got bazillions of tiny individual drops of oil (yellow) and just as many drops of VG (frosty) producing the milky yellow.
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