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iibubblii
Сухая
Hi, I actually talked about this in one of my reviews. I didn't go in depth though.
The color changing you see is present in all forms of vitamin c acids. It's due to it's nature to react to oxygen. This is called oxidation. When vitamin c is constantly exposed to the air we breathe in, it starts to lose its hydrogen atoms. This decreases the effectiveness of the acid. You can still use, but it will no longer be at the percentage you bought it at. That's why vitamin c serums are sold in small quantities.
Think of it as you have a jar of smoke and every time you open it, some of the smoke escapes. Eventually you will have none left.
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iibubblii
Сухая
No, alpha arbutin is not a type of vitamin c. It's a skin brightening ingredient.
L-ascorbic acid is the most common type of vitamin c used. You will see that a lot.
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hdlums
Жирная
I saw a dermatologist video (Dr. Ingky), he said its their natural occurence that the product change color over the time. Its alright to use the product even after the color changes.
From what ive learned, it is because of the oxidation, they absorb oxygen from the outside or exposed to light/heat. No worries still effective even not as effective as before the color changes.
Thats the reason why serum always in a small bottle (estimated 1-2 months), or in dark amber glass bottle. Also, recommended not to keep serum in hot and humid places.
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