thaibrawler Posted February 12, 2004 Share Posted February 12, 2004 I was told by my teacher that suncreen has no point. It really doesnt protect you. He said it was for money and such. I dont remember the chemical he mentioned that said it was harmful, when I think of it Ill add it. So now my point is it it really true? I think that one whould not need sunscreen because if your body is feeling hot, and you are turning red isnt it telling you to go home. Link to comment Share on other sites More sharing options...
blike Posted February 12, 2004 Share Posted February 12, 2004 Haha no crap! My organic professor just said that like a week ago. You woudln't happen to be in Dr. Wofle's organic 2 lecutre at USF would you (University of South Florida)? Link to comment Share on other sites More sharing options...
thaibrawler Posted February 12, 2004 Author Share Posted February 12, 2004 no comment .....but you dont ahppen to remember the chemical do you? ^__^' ~.^ Link to comment Share on other sites More sharing options...
Cap'n Refsmmat Posted February 12, 2004 Share Posted February 12, 2004 All I know is that when I wear sunscreen I don't get sunburned. Link to comment Share on other sites More sharing options...
blike Posted February 12, 2004 Share Posted February 12, 2004 Yes, I have the chemical in my organic notebook. I'll dig it out for you around 9 tonight. Link to comment Share on other sites More sharing options...
Ms. DNA Posted February 13, 2004 Share Posted February 13, 2004 I got sunburned a few years ago when I went to the beach. I only got sunburned on my back, where I couldn't apply sunscreen properly. So sunscreen has to do something to protect the skin. And if your skin turns red, isn't it already damaged? Link to comment Share on other sites More sharing options...
blike Posted February 13, 2004 Share Posted February 13, 2004 Thai, the name of the compound is Titanium dioxide (TiO2). It's a known carcinogen. Dunford R, Salinaro A, Cai L, Serpone N, Horikoshi S, Hidaka H, Knowland J University of Oxford, Department of Biochemistry, UK. This is now a known carcinogen Titanium dioxide (TiO2) has been noted (US Federal Register, 43FR38206, 25 August 1978) to be an unsafe physical sunscreen because it reflects and scatters UVB and UVA in sunlight. However, TiO2 absorbs about 70% of incident UV, and in aqueous environments this leads to the generation of hydroxyl radicals which can initiate oxidations. Using chemical methods, we show that all sunscreen TiO2 samples tested catalyze the photo-oxidation of a representative organic substrate (phenol). We also show that sunlight-illuminated TiO2 catalyses DNA damage both in vitro and in human cells. These results may be relevant to the overall effects of sunscreens. PMID: 9414101, UI: 98074912 45: Toxicol Lett 1995 Oct;80(1-3):61-7 Link to comment Share on other sites More sharing options...
fafalone Posted February 13, 2004 Share Posted February 13, 2004 hmm... titanium dioxide is present in just about every pill you take... Link to comment Share on other sites More sharing options...
JaKiri Posted February 13, 2004 Share Posted February 13, 2004 TiO2 is used mostly in white paint. Link to comment Share on other sites More sharing options...
YT2095 Posted February 14, 2004 Share Posted February 14, 2004 I use to handle 55 kilo bags of that to mix with nylon and hostaform beads as colorant for plastic injection moulds, no warnings there either, the other carcinogenic dyes were all locked up in a special cupboard that you`de need to sign for and have weighed. as faf says they`re in pills too. maybe it`s something that`s ok internaly but reacts badly upon UV exposure? I`ve just had a look at some factor 12 sunscreen, there`s no TiO2 in it (a whole bunch of other stuff, but no dioxide)? Link to comment Share on other sites More sharing options...
blike Posted February 14, 2004 Share Posted February 14, 2004 I'm finding lots of suncreen/sunblock that use it: http://www.sungrubbies.com/SunblockSunscreen.htm http://www.drugstore.com/qxp37882_333181_sespider/peter_thomas_roth/titanium_dioxide_sunblock_spf_30.htm Looks like its used more in sunblock than sunscreen. Link to comment Share on other sites More sharing options...
thaibrawler Posted February 15, 2004 Author Share Posted February 15, 2004 whts the actual difference between sunblock or screen good job on the notes there blike Link to comment Share on other sites More sharing options...
Guest JerzyGirl Posted June 3, 2004 Share Posted June 3, 2004 TiO2 is used in almost every type of cosmetic product as a white pigment and as a physical sunscreen. It can provide a pretty high SPF and an even higher one when combined with organic chemical sunscreens that abosorb UV radiation. I have never heard that TiO2 is carcenogenic or hazardous. I work in the cosmetic industry and I'm around the stuff all the time. The chemical sunscreens are more hazardous and irritating that ZnO and TiO2. The SPF is the ratio between the time it takes for UV exposure to produce erythema (redness) on protected skin over the time it takes to cause reddness on unprotected skin. UVB radiation is what causes sunburn, UVA is what contributes to wrinkles, skin cancer and suntans. The SPF of a product has absolutely nothing to do with UVA protection. While many products claim UVA/UVB protection there is currently no way to quantify UVA protection. This is something the FDA in the US is looking into. In the USA sunscreens are considered drugs and are heavily regulated by the FDA, who is banning the terms "sunblock" and "waterproof" on labeling for sunscreen bottles. Link to comment Share on other sites More sharing options...
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