Why does the E-Liquid
sometimes change color?

e-liquid color:

First of all it is perfectly normal for your e liquid to change color.
Therefore if you by an e liquid with a color , if that color changes after a couple of days
do not worry. It is still very safe to use it.

What makes the e-liquid change color ?

Furthermore there are a couple of different factors that can make the e-juice change color.
First factor can be the exposition to air.
Depending on how you use your e liquid sometimes while is exposed to air it affects the color of it.
Another factor is the light that your e liquid is getting.
Here it can be too much light or even the lack of light.
As a result your e liquid will change color.

e-liquid color

Most common reason of the e liquid changing color:

Furthermore the color changing can be a result of a common chemical reaction known as oxidation.
Nicotine is a very reactive substance and can cause e-liquid to change color.
Than can happen when is in reaction with other ingredients in the juice like the glycerine or the flavor.

Is the E liquid safe when it changed e-liquid color ?

If your e liquid changes color for any of the reasons from above,
you can use it with no problem or doubts.