http://walthamstow.london/News/avoid-mistakes-when-choosing-skin-care-product/ A basic solution might last for a week or two. When it begins to turn orange it has oxidized. However, you can certainly make a slightly more advanced solution likewise allows last longer by adding ferulic acid, which stabilizes Ascorbic Acid, making your solution efficient for much longer. Here is the recipe. To find more useful reviews consult a consumer research Thu, 03 Nov 2016 15:56:46 UTC en