[PwrsNY]

What about Menthone Glycerin Acetal and Menthyl Lactate, ratio of 1 to 2 % each… Often found in cooling sticks, water based formulas…..

[PwrsNY]

Any thoughts on the above ? Still can’t solve this problem. It seems that due to the lipstick being a “semi permanent” that dries down, setting the color in place, that creates a barrier to not allowing the staining pigments to adhere to lips and work with the pH. Any work around ?

[PwrsNY]

You have to get the compositional breakdown from the chemical vendor…. After that you multiply each individual part of the composition by the percentage of the blend in your formula to come up with the actual percentage of the particular ingredient in the blend in your formulation… Then you can determine how to list them in descending order and as mentioned, if less than 1 % it is up to you how to list them… I usually keep preservatives at the end of the list as well as any Vitamins……

[PwrsNY]

I usually use 0.20 % for Lip products of Tocopheryl Acetate ( Vitamin E ).

[PwrsNY]

That is very helpful. THank you. Any insight on extending bulk shelf life after expiry ? If a product is still stable ?

[PwrsNY]

Shade matches dictate whether there is TiO2 in the formula or not…. Either way I do not think it will pass the barrier formed by the Isododecane solvent base. I am coming to the conclusion there is not a way to have these dry down, transfer resistant liquid lipstick formulas with a stain that will penetrate the lip and add even more long lasting properties.

[PwrsNY]

So if a formula passed a 3 week stability and then a 3 month study, what could be safely established ? Anhydrous formula containing a natural preservative system and sales. Basically a scrub for the scalp .

[PwrsNY]

The problem there is consumers don’t want parabens anymore…..especially underarm deodorant products..

[PwrsNY]

Doesn’t it depend on a claim and how it’s made…. Reduces odor as opposed to stops sweat.

[PwrsNY]

That was my thought…. if the client were to claim that though, correct?

[PwrsNY]

It is a lipstick that does not need a preservative… But I understand what you are saying… it would not serve a purpose from a microbial standpoint…

[PwrsNY]

Correct, I had one client accept an extended 2 year expiration date off the original manufacturing date and another client say it was unacceptable… We completed a new C of A which reviewed texture, odor ( rancidity ), appearance, melting point, after subjecting the Batch to heat in a kettle and remix just to make sure any contamination was eliminated and that the bulk functions as normal….On lipstick I am not worried about the preservative system as this particular formulary is almost impossible to grow microbes… I was just wondering if this is acceptable to regulatory agencies or if it is strictly up to the manufacturer who feels the product is still good and stable and then gaging acceptance from clients on whether it is acceptable or not based on their perspectives as you mentioned…..

[PwrsNY]

So should expiration dates be assigned when a product is filled into packaging or when a product is dropped from Batch? My company had lipstick for example that we assign a 2 year expiration date to from the date the Batch was made. But sometimes filling is not drawn off that Batch for a year and a half which renders the expiration date closely approaching, but the bulk lipstick still appears in good form… We draw off the Bulk as needed to fill. I am trying to see how to extend those expiration dates so that we do not have to throw good material away if sales may be slow for a particular color that year…..