[carvan]

Doreen,
  Would you be interested in testing the original ingredient list I posted to see if you can make it colorless and if it holds up reasonably well from oxidation…I would be interested in paying you for it?

[carvan]

Doreen,
  I agree. This list of ingredients was taken from website who is selling these products at a high rate. I have been wanting to develop my own Vitamin C serum for several years…so I bought this product from their company. I was surprised how clear the finished product was and was looking for some ideas on how they could have accomplished that.

Their final product color is same as Witch Hazel which is remarkable considering Vitamin E is dark amber and in my test I was not able to get Ferulic Acid to dissolve into crystal clear color but was cloudy. As you mentioned…I see no solubilizer listed in their ingredients. I am half temped to get their product tested at lab to see whats really in it. 

[carvan]

not sure you need incubator if your willing to wait 30 days at room temp. I use Mikrocount slides to initially test preservative systems and only send to lab if it passes the 30 day challenge. The lab test can get very expensive quickly especially if you have multiple products to test. What you want to avoid is having to get same product tested multiple times until it passes. The strips should eliminate that. good luck.