Talk:Titanium dioxide

message: The values refers to STP, but it says 0°C (273,15 K). In Europe I think that is 25°C. Either STP is wrong or please clear this out for me. :-) (What is the "standard temperature"?) // Rogper 10:41, 16 Feb 2004 (UTC)
replies: text: Well I also see 6 red and 9 grey balls. BUT you should only count the balls inside the box. There is one grey ball fully inside the box. The 8 balls at the corners of the box have only a small part inside. If you combine the small parts they will make a second grey ball. Now you have two grey balls. There are two red balls balls fully inside the box. The two upper red balls are only halfways inside the box and the same goes for the two lower ones. So there are 2 balls plus two halves (upper) plus two halves (lower), all together 4 red balls. The graphic shows two formula units of TiO2 ie the ratio is correct.Stenallan (talk) 15:49, 9 April 2015 (UTC)
thread_title: Untitled

message: Titanium dioxide is also used extensively in the handmade soap crafts as a colorant/pigment.  It was interesting to find out that it is not a naturally occurring mineral/metal.
--- Paul E. Achuff, Sr. — Preceding unsigned comment added by 68.234.74.59  (talk • contribs) 20:53, 16 November 2005
:Titanium dioxide does occur naturally (see rutile), but not in sufficient quantities or purity to make this a reasonable commercial source. Physchim62 (talk) 04:49, 17 November 2005 (UTC)
thread_title: Other TiO<sub>2</sub> uses

message: I am doing a sciende fair project over lipsticks. In order to make the color pink, you must mix titanium oxide and various shades of D&C red no. 21-27 -ish it depends on how dark of lite you want it. 
My question is How Does Titanium Oxide form, is it the gas that is released or is it a chemcial reaction with another element? 
Please help me. 
You would like to. 
Much appreaciated. 
That science nerd, 
Katie 7th grade. — Preceding unsigned comment added by 66.68.55.106  (talk • contribs) 04:11, 30 November 2006
:Titanium dioxide is made by reaction of titanium tetrachloride with water, as described here.  I know this first hand - the chemical plant I used to work at was near a big TiO2 plant, and there was a TiO2 "snow" lying all around the plant from years of them running that reaction!  TiCl4 itself is a liquid, so the reaction with water can produce a fog of TiO2 under some conditions (see Titanium_tetrachloride#Smoke-screens). I presume that the reaction produces a fairly consistent particle size, as needed by the paint industry, this would not be the case it you simply tried to take rutile and grind it up.  Walkerma 15:58, 30 November 2006 (UTC)
replies: text: Titanium dioxide is found in the ground as the minerals anatase and rutile. However, it must be purified before it can be used in paints or lipsticks, because the natural form contains to much iron. Physchim62 (talk) 18:13, 30 November 2006 (UTC)
thread_title: How is this formed?

message: By far the most important use of titanium dioxide is as a white pigment. Reason being, titanium dioxide has a very high refractive index. Simply speaking, the higher the reflectance the greater the ability to scatter light. The author has stated the refractive index as 2.4. This is only partialy correct. The refractive index of the anatase crystal is 2.4 while that of the rutile crystal is 2.7. It should be no surprise then, the rutile form of titanium dioxide is most predominantly used in paints and plastics. 
Generally speaking, this difference in refractvive index provides for rutile titaniun dioxide to be 30% more efficient than anatase in a paint or plastics. —The preceding unsigned comment was added by 68.39.4.210 (talk) 19:41, 10 December 2006 (UTC)
thread_title: Refractive Index

message: A single value is given for the elastic modulus.  This is ambiguous to me for two reasons:  firstly, is the number given for rutile or anatase?  Secondly, both rutile and anatase are anisotropic materials, and therefore they will have different moduli along the different axes of their crystals.  Another, less important reason why this is ambiguous, is that the name "elastic modulus" isn't as specific as it could be.  I know it probably means Young's modulus, but it would be nice to just say that. Ed Sanville 13:12, 17 January 2007 (UTC)
thread_title: Elastic module

message: Considering TO2's potential as an oxidiser and producer of free radicals, it's a concern that we use this product so extensively on our skin. It will be interesting to see if there is any future correlation between the use of TO2 and development of skin cancer. Especially as it is often formulated in sunscreens as a 'safe' alternative to chemical UV absorbers. 
58.7.57.55 02:50, 14 April 2007 (UTC)
replies: text: That's why the cosmetic grade is doped with (IIRC) manganese to quench the excited state. 70.16.205.62 03:12, 26 July 2007 (UTC)
thread_title: Titanium dioxide in cosmetic products

message: The ref is very old (1941)- is TiO2 really used as a semi-conductor or has it just got  semi-conducting properties?--Axiosaurus (talk) 16:32, 4 May 2008 (UTC)
thread_title: Used as a semiconductor

message: This article talk page was automatically added with  banner as it falls under :Category:Food or one of its subcategories. If you find this addition an error, Kindly undo the changes and update the inappropriate categories if needed. The bot was instructed to tagg these articles upon consenus from WikiProject Food and drink. You can find the related request for tagging here . Maximum and careful attention was done to avoid any wrongly tagging any categories , but mistakes may happen... If you have concerns , please inform on the project talk page -- TinucherianBot (talk) 01:22, 4 July 2008 (UTC)
thread_title: [[WP:FOOD|WikiProject Food and drink]] Tagging

message: I, in the last few years, have discovered an increasing reaction to Titanium Dioxide.  It was due to an earlier article here I was finally able to purge it from my life.  The edited version now has enlightened me even more.  Though I have minor reactions to Zinc, Aluminum and Tin Oxides, my Titanium Dioxide allergy stumped my allergist and she was amazed I was able to figure it out.  Thank you for continuing to build on this page to help people like me!  ---Allergy Misfit  —Preceding unsigned comment added by Titaniumallergies (talk • contribs) 03:41, 25 August 2008 (UTC)
thread_title: Titanium Dioxide Allergies

message: It seems the entire toxicology section has been copied verbatim from this page: http://www.ccohs.ca/headlines/text186.html  —Preceding unsigned comment added by 205.210.232.62 (talk) 18:23, 15 December 2008 (UTC)
thread_title: Plagiarism

message: I removed this line from the external links section:
*  "Diflucan antifungal med has titanium dioxide "inactive ingregient" in suspension - see page 1 of linked full prescribing info from Pfizer". Is it carcinogenic like the powder breathing is?
The answer is no; see the article and various sections of this talk page. --ἀνυπόδητος (talk) 19:06, 28 December 2008 (UTC)
thread_title: Removed link

message: I think the solubility is wrong, 7.4 times 10 to the 5 molars?! Titanium dioxide is insoluble in water! Maybe it's negative 5? — Preceding unsigned comment added by 76.66.48.56  (talk • contribs) 00:24, 5 December 2009
:Sure. Thanks. Removed. Materialscientist (talk) 00:28, 5 December 2009 (UTC)
thread_title: Solubility

message: Since inhaling Ti02 dust causes lung cancer, it seems that the common event of people having on occasion food going down the wind pipe would open lung cancer from Skim Milk as a risk.  —Preceding unsigned comment added by 71.114.180.207 (talk) 03:24, 17 September 2010 (UTC)
thread_title: logic of Titanium Dioxide in milk

message: This sentence from the "Occurrence" section needs revising.  Can someone please help?
[3] Rutile, anatase and brookite all contain six coordinated titanium.  — Preceding unsigned comment added by Trains88 (talk • contribs) 18:48, 8 December 2010 (UTC)
thread_title: Occurrence of titanium oxide

message: I am extremely dubious about the claim of 70% of the volume of all pigment uses. In virtually every paint formula I have seen, titanium dioxide volume is overshadowed by filler pigments such as calcium carbonate and talc. -Tom2K  — Preceding unsigned comment added by Tom2K (talk • contribs) 13:19, 21 October 2013 (UTC)
thread_title: Health and safety

message: Deleted this section.  This is pretty specific, a whole section seems a little much.  — Preceding unsigned comment added by 129.100.60.189 (talk) 15:01, 24 June 2011 (UTC)
thread_title: Nanotubes

message: I read the article page and this text page.  Not much seems to be said about the use of titanium dioxide directly in food.  I'm very interested in a new product called Daiya (www.DaiyaFoods.com).  Daiya is a vegan "cheese" substitute.  One of the ingredients in Daiya is titanium dioxide.  
I want to know about the safety of titanium dioxide as a food product (as opposed to inhaled or used on teeth or skin/external).  I don't know if it is appropriate to ask for such a thing here since I've never submitted anything to wikipedia.  Just in case it is OK to do so: Any additional information added to the article in regards to the safety of this product as a food item would be appreciated.  — Preceding unsigned comment added by 199.79.32.23 (talk) 16:33, 27 June 2011 (UTC)
thread_title: What is safety when used directly in food?

message: Saw some info on this on TV and checked. It seems to be very important but I'm not a skilled Wiki editor myself. I wonder if it should be put it in the article. Can anyone help? 
# concurrently produce both hydrogen and clean water when exposed to sunlight
# be made into a low-cost flexible filtration membrane that is anti-fouling
# desalinate water as a high flux forward osmosis membrane
# recover energy from waste desalination brine and wastewater
# be made into a low-cost flexible solar cell to generate electricity
# doubles battery life when used as anode in lithium ion battery 
# kill harmful microbial, leading to new antibacterial bandages
* Main source:  http://media.ntu.edu.sg/NewsReleases/Pages/newsdetail.aspx?news=14e3b618-c71c-4f20-935c-2a566af5a298
* D.D. Sun (Darren Delai Sun)'s published papers: http://www.ntu.edu.sg/home/ddsun/publication.html
More info: 
* http://www.sciencedaily.com/releases/2013/03/130320094856.htm
* http://www.sciencedirect.com/science/article/pii/S0926337313001926
--KenLee318 (talk) 09:57, 27 April 2013 (UTC)
thread_title:  Multi-use TiO2 nanofiber membrane from Nanyang Technological University 

message: What's the relevance of this link in the main article to a "Timeline of hydrogen technologies" when this timeline makes no mention of Titanium at all?  — Preceding unsigned comment added by 217.155.200.241 (talk) 11:40, 19 June 2015 (UTC)
replies: text: No apparent connection to this link and deleted.Ekem (talk) 13:20, 27 July 2015 (UTC)
thread_title: Question

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thread_title:  External links modified 

message: According to Chemical Abstracts, 453380 articles, reports, patents, etc describe TiO2, of these 6429 are reviews (per WP:SECONDARY, of which 1894 appeared in the preceding 5 years.--Smokefoot (talk) 13:16, 28 November 2017 (UTC)
thread_title: 453380 citations and counting ...

message: Today I removed this well intentioned list of potential applications.  Given the number of reviews, we could probably stick to them for sources.--Smokefoot (talk) 13:16, 28 November 2017 (UTC)
thread_title: Probably not applications

message: Is there a reason why the use of Titanium dioxide as a Food additive is excluded from the article? 
* Titanium Dioxide in Food www.webmd.com
* Titanium Dioxide in Food — Should You Be Concerned? healthline.com
* Titanium dioxide: E171 no longer considered safe when used as a food additive European Food Safety Authority
// Knowsetfree (talk) 00:09, 29 October 2021 (UTC)
replies: text: More than one publication/patent appears daily on this stuff.--Smokefoot (talk) 03:21, 29 October 2021 (UTC)
replies: text:  I was shocked upon learning that Titanium dioxide is actually put into some commercial processed foods. So I came to WikiPedia hoping for some unbiased truth and there is nothing. What's up with that???? Knowsetfree (talk) 00:35, 5 November 2021 (UTC)

text: The fact that it's no longer considered safe to use in food doesn't mean that it's *actually* no longer used in food.  I bought a pack of candy just the other day that has it listed as an ingredient.  Fact of the matter is that it is still used as a food additive outside of the EU, and that should probably be noted somewhere (along with the potential concerns about its continued use in such a capacity).128.154.172.234 (talk) 15:25, 6 April 2022 (UTC)
thread_title: Food Additive

message: Companies such as Mars and Dunkin' Donuts dropped titanium dioxide from their merchandise in 2015 after public pressure. Mars has not dropped titanium dioxide according to a       lawsuit filed in 2022. However, Andrew Maynard, director of Risk Science Center at the University of Michigan, downplayed the supposed danger from use of titanium dioxide in food.
I take issue with the use of "downplayed", as downplayed implies that its more significant than he is letting on - and this is presented as a fact. Even if he is wrong - this is a NPOV issue.
I recommend changing to something like "argues that in his view, the risk of titanium dioxide in food is exaggerated."
"He says that the titanium dioxide used by Dunkin' Brands and many other food producers is not a new material, and it is not a nanomaterial either. Nanoparticles are typically smaller than 100 nanometres in diameter, yet most of the particles in food grade titanium dioxide are much larger. Still, size distribution analyses showed that batches of food-grade TiO₂ always include a nano-sized fraction as inevitable byproduct of the manufacturing processes."
I would prefer a direct quote to what is borderline editorializing here. 
If you just want to say he's wrong, then this section should be removed altogether. If you want to provide an opposing viewpoint, then this should be more professionally worded. Otherwise this just seems like a callout. This is an encyclopedia on a compound, not an opinion piece. Everything on here should be factual and shouldn't be used simply to disprove someone with no significance to the discovery, invention or otherwise to the compound, even if they're wrong, especially if they're wrong.
 Maynard states in his article for The Conversation, an independent academic news and research site, titled "Dunkin’ Donuts ditches titanium dioxide – but is it actually harmful?" the following quote: "The titanium dioxide used by Dunkin’ Brands and many other food producers is not a new material, and it’s not really a “nanomaterial” either. Nanoparticles are typically smaller than 100 nanometers in diameter. Yet most of the particles in food grade titanium dioxide are larger than this. They have to be for the powder to be of any use in food products." 
Obviously this needs some work, but I would prefer to see something more with this verbiage - followed by any additional information after - 
 Still, size distribution analyses showed that batches of food-grade TiO₂ always include a nano-sized fraction as inevitable byproduct of the manufacturing processes.
This is directly plagiarized from its source. 
To have something like this follow in a short section makes it appear as if the purpose of the entire section was only to discredit him. If he is to be discredited, then he should not be mentioned and this should be removed. The purpose of wikipedia is to compile information.
Adding to this, you might want to have something after that resolves the contradiction, allowing both sides saying something along the lines of 
 Despite the contradiction, the relative percentage of nanoparticles was not stated in the source, so the negligibility of the nanoparticles, though harmful in significant amounts, is unknown. 
DarmaniLink (talk) 12:01, 27 July 2022 (UTC)
replies: text: I'm not going to blank this, but this was when i was new. Please disregard. DarmaniLink (talk) 08:10, 23 February 2024 (UTC)
thread_title:  Health and safety 

message: I have extensive professional experience using TiO2 for industrial pigments. First, pigment isn't a dye. Second, pigment isn't necessarily inorganic, but most are. (There're also some metal-organics.) Third, I can only speak to its use in the USA. Fourth, "fillers" are, by definition, used because they reduce the cost of a mixture - they occupy (i.e. "fill") space which would otherwise be occupied by the more expensive components. (Fillers often also change the properties of the mixture, sometimes for the better, sometimes for the worse. They usually impact color (act as pigments), but they're inefficient pigments (which for some uses is acceptable).) To some extent, "functional filler" is an oxymoron, but in detail is often (a neglected) truth, fwiw. But enough about fillers. Rutile and Anatase are the only *crystalline* forms of TiO2 sold in large volumes. Over the past several decades "nano" forms (which may or may not be crystalline) have entered the market. This article blunders BADLY in dumping all of these DIFFERENT chemicals, with DIFFERENT CHEMICAL PROPERTIES, into the same basket. I state, categorically, that IF a designation (name) for a type of TiO2 includes more than 1 of the 3 above (Rutile, Anatase, nano) then that designation is obsolete and should be depreciated. (If I recall (I may not) correctly, in mid-20th Century USA Anatase predominated, but since Rutile has higher refractive index, less of the more expensive material is needed for the same "hiding power" and/or "whiteness". The cost/benefit equation often, but not always, favors the Rutile more recently. Last and perhaps most important. It is simply NOT TRUE that the material known as TiO2 commercially is simply TiO2. This article completely ignores the FACT that a lot of (most of the industrial pigment grades) Rutile is COATED. That is, each particle is composed of a core of TiO2 surrounded by a thin shell. I believe most of this is single shell, but multiple shells are also sold. The most common shell is SiO2 (amorphous (iirc) silica) but ZrO2 was at one time, an alternative. In addition, various silanes (organo-silicon compounds) can be used to modify various properties (also organotitanates, organozirconates, and even some hydrocarbon oils). The reason the TiO2 is coated is well-known (since it was discovered in the 1950s or 60s). Rutile (I'm not sure about Anatase) is photoactive. It absorbs UV and generates free radicals on its surface. These free radicals cause rapid decomposition of organics, especially polymers (the main component of paints and plastics). I do not know if this is also the case with food grades, cosmetic grades, or pharmaceutical grades. To sum up, this article doesn't distinguish between the actual products that are sold and used. A variety of crystal structures and surface coatings are in wide use all of which effect chemical and physical properties. Since this is OR, I refrain from changing the article. But it's widely known. The article needs to be rewritten. There's increasing evidence that (some grades of) TiO2 cause DNA damage and are likely carcinogens. Simply because it is used in personal care products (pharmaceuticals, cosmetics, food) in some countries (i.e. the good ole USA) does not necessarily mean the claim that "Titanium dioxide is safe" is true. Any blanket statements like that should be viewed with a LOT of suspicion. (And should NOT be included here, imho). (to make a blanket statement myself, LOL)71.30.91.96 (talk) 18:03, 18 May 2023 (UTC)
replies: text: @71.30.91.96 I actually read a paper about TiO2 on pub med after reading this wiki article. I basically illustrated eveything you said. I actually came to the talkpage to see if anyone had wondered why the article seemed to neglect to mention most (if not all) of what you and the paper mentioned. Just wanted to thank you 96.227.239.25 (talk) 21:36, 6 April 2024 (UTC)
thread_title:  What exactly TiO2 is.