E liquids can vary in colour for a number of reasons. Some manufacturers choose to add colouring to their liquids to create an attractive looking product (for example the legendary Heisenberg by Vampire Vape which is blue like the product produced by chemist Walter White in the awesome TV show Breaking Bad). A great many liquids however are clear, or display a slight yellow or brown colour. You will often find that the stronger the nicotine strength of a liquid the darker the shade will be, as nicotine has a slight colouration to it and this tends to darken over time. If a liquid has been exposed to air for any period of time it may also appear slightly darker in colour.
So, you could find that you buy several liquids that are exactly the same brand, strength etc yet look slightly different. This happens all the time and is nothing to worry about. It could be that the liquids are from a different batch and have been steeped for slightly longer, or are very slightly older. Either way, these factors should have zero impact on flavour.
If, of course, you feel that the flavour of your liquid has been affected in some way and you’re not happy with any purchase from us, please feel free to submit a ticket and we’ll be more than happy to help.