Let’s discuss this topic in a nutshell quickly…
I often get these questions about the gel polish colours that is not the same anymore when you open your bottle after a while; after NOT using a specific colour, so here is what you can do…
Some colours are more popular than others, right? So yes, one or two of your colours will be standing longer on your nail technician trolley or shelve in your salon, without using it. BUT you do want to keep a large enough range to provide your client a variety of colours to choose from for a toe overlay for example. So now your client chooses a colour that has been standing for quite a while on the side without touching it and without any movement.
Firstly I would like to emphasize in-between, that you did store the colour in a dark, cool place, without exposure to any heat or UV exposure…
When you open the bottle it might seem that the colour is somewhat lighter than it use to be and it looks like it has separated from the rest of the ingredients in the gel polish bottle. If it was standing for a while you can mix the gel polish with a toothpick to better mix the colour. If it has been standing for not so long a period you can roll it in your hands to mix the colour. BUT, this needs to be done before you start with your client’s treatment. When you do mix your colour, you will add some air bubbles in your colour that will later show up when you do your overlay and cure the gel polish product. So best to mix it beforehand to enable your colour to subside with the air bubbles inside of the bottle created by the mixing of the colour.
Should your colour after mixing do look lighter than it was, then this might be to light, heat or UV exposure. The colour is still in order to use and will cure, but might just appeal to be a bit lighter than it initially was. During a previous application the colour in the bottle might have been exposed or during storage. So be careful.
Some has had the unfortunate surprise when they do open their bottle the colour has completely hardened inside of the bottle. A colour can only harden under the conditions it was designed to turn liquid into a solid by heat and UV light exposure. Be careful when handling your gel polishes.
Cross contamination might also have taken place. When you previously worked with the gel polish colour, it might have been exposed to certain chemicals, without you knowing it and it had time to harden the gel polish inside the bottle, so by the time you do open the bottle the colour has hardened completely.
I say once again… you work with chemicals that has been formulated to perform and change under certain conditions to give you the end result you desire. Should you not use these chemicals as you should or should not, then you will get undesired results.
One last note… clean the neck of your bottle every time after use and before storage. This will prevent build-up of hardened gel polish around the neck of the bottle.