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Photostable Sunscreen/Sunblock
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faith
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Thu Apr 28, 2005 10:40 am      Reply with quote
I have 2 questions. First, if a sunblock contains (this is the order listed on the package) Benzophenone-3, octocrylene, octymethoxycinnamate, titanium dioxide, zinc oxide as the active ingredients, is it photostable?

Second, after getting some BE, I need to find a uv protection product that absorbs easily and quickly enough so that I can put on my new fab powder. Any ideas?

TIA Very Happy

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Bad Bird
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Thu Apr 28, 2005 10:53 am      Reply with quote
Hi Faith,

The only photostable actives are octocrylene, titanium dioxide and zinc oxide. The sunscreen is only partially photostable.

Benzophenone-3 has good attenuation in the UVA spectrum but it is not photostable. Unfortunately, this happens to be the active with the highest percentage (first listed).

If you're looking for a sunscreen with photostable and high UVA protection, this is not going to be the one. Having said that, this product is probably a lot better than others as it is at least a combination sunscreen, which means that the SPF is probably quite high.

If you want a non-oily sunscreen that you can directly apply your BE on without it grabbing onto oily areas, then you're better off getting a physical block. Most chemical sunscreens are oillier.

One chemical sunscreen I tried which is quite light (on my combination/oily skin) is Biotherm White Detox UV Extra Protect SPF 50 PA+++.
purpleturtle
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Thu Apr 28, 2005 11:02 am      Reply with quote
Badbird...that confuses me. Since a physical sunblock is pretty much zinc oxide and titanium oxide..ive been told it doesnt go well with mineral makeup. I use skinceuticals physical block 30 and BE (which im soon switching), and its really hard to achieve a natural look on my skin:/
Bad Bird
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Thu Apr 28, 2005 11:22 am      Reply with quote
Hi Purpleturtle,

I know what you mean without having experienced it myself. Phyical blocks don't go well with mineral makeup because really, you are just piling on the minerals, which may add to the reflective properties, for example. Some users have already noticed a white/pearly sheen to their mineral makeup.

When I suggested the physical block, I was thinking more of micronised zinc oxide ones, which doesn't leave a white cast. The SkinCeuticals Physical Block contains micronised zinc oxide, which is transparent, but it also has a higher percentage of titanium dioxide. Titanium dioxide is a lot whiter than zinc oxide and we're not even talking about the micronfine type.

My own take on this is that if I'm using mineral makeup, I will use a chemical/combination sunscreen beneath. That way, any UV rays not blocked by the makeup will be absorbed underneath. But the other reason is that combination sunscreens provide better UVA protection. Of course, I have to deal with the oiliness of it, which is a small price to pay. Physical sunscreens are definitely less oily. This is the reason I've ordered Jane Iredale's Absence, to prime the skin for makeup.

Hope that helps! Smile
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