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The article says that Prussian blue is used for chelation therapy. Prussian blue is indeed able to sequester certain metals, but it doesn't do so through chelation. Chelation requires a multi-dentate ligand to bind to a metal. Prussian blue sequesters metals by absorbing them into its lattice, which isn't the same thing. Unless someone wants to explain why the term "chelation" should stay, I'm going to remove it from the article. —Preceding unsigned comment added by 128.227.179.89 ( talk) 21:44, 13 February 2009 (UTC)
The article mentions Tyrian Purple as fading over time. This is not true, with the wikipedia article for it stating that exposure to sunlight and weathering, which usually destroy most pigments, actually strengthens and brightens the color. Other murex snail-derived dyes also have similar properties, often only showing their color after light exposure. (UTC) — Preceding unsigned comment added by 218.214.214.252 ( talk)
As any formally trained color scientist would confirm, it is inappropriate to use unqualified color coordinates to specify a color appearance. In the Prussian Blue article, as I would guess all the other color-related articles, there is a box on the upper-right of the page that pretends to state the color coordinates of the color in RGB, CMYK, HSV and Hex values. This is wholly incorrect. RGB values in themselves cannot depict color appearance. In order to do so, the RGB triplet has to be connected to physical reality through, at the minimum, the definition of the RGB color space used, the white point of the illuminant, and in certain cases, the gamma function. The ICC specifications can help one understand what these requirements are. If Prussian Blue has such and such color coordinates, they have to be qualified as, for example, in AdobeRGB color space. Better still, linear XYZ color coordinates should be used. Furthermore the conversion of RGB to CMYK is wholly dependent on the particular transfer functions used for a specific set of inks and paper combination - the idea of posting the CMYK color coordinates for a physical color appearance is naïve at best and mostly preposterous.
As such the article runs contrary to the most basic precepts of color science, and is wholly misleading to uninformed readers. Trying to digitally reproduce the appearance of Prussian Blue using the information contained herein will not work at all. (unsigned comment by User:Ppanzini on 2006-11-21T07:50:27)
I wish that I could help more precisely with this one, but not being a chemist, a chemical engineer, or a medical doctor, I can't give the actual numbers. (However, I am an electrical engineer and a mathematician - with master's degrees in both - and I can tell when numbers don't make too much sense.)
Considering that the molecular formula of Prussian blue is Fe7(CN)18(H2O)x, where the 7, the 18, the 2, and the x are subscripts, and 14 <= x <= 18, to say that its Molar Mass is 859.23 g/mol is to an absurd level of precision. As x varies between 14 and 16 (inclusive), depending on the water content of the substance, the Molar Mass varies by a significant percentage. So, the Molar Mass should be expressed as a range, with a minimum value and a maximum value. 74.163.48.102 ( talk) 05:03, 2 October 2008 (UTC)
The only place I ran across Prussian Blue outside of art history or a chemistry class was in a discussion of proving certain buildings were used as gas chambers in concentration camps - as I recall, the claim was that Prussian Blue formed on the rusted iron drain pipes of the shower rooms that had been repeatedly exposed to the cyanide.
Is this a subject we want to include in this article, or do we not want to touch that? TaigaBridge 21:56, 16 May 2007 (UTC)
I've copied across material from Zyklon B. Please edit as needed. Ty
Prussian blue is also known as a histology stain, to test for iron. In fact, this page is linked from the histology page, section "staining" http://en.wikipedia.org/wiki/Histology#Staining
Info on the stain can be found at: http://cancerweb.ncl.ac.uk/cgi-bin/omd?Perls'+Prussian+blue+stain
Perhaps a new section titled "Staining", or a new link option for "Prussian Blue Iron Staining"?
68.163.33.106 03:47, 1 September 2007 (UTC)Mko
There is an "other properties" section and "culture" section. Why? First, things like its being used for treatment of ingestion of cesium should be in the medical properties, and medical properties should NOT be considered culture. Second, cesium plays an insignificant role in pop culture. In my opinion, the "culture" heading should be eliminated and the text within that section should be moved to the appropriate places in the article, or separated into "uses" and "properties". —Preceding unsigned comment added by Rocketman768 ( talk • contribs) 02:37, 17 October 2007 (UTC)
The uniforms of the Prussian army.... wern't they Prussian Blue? —Preceding unsigned comment added by 86.151.178.205 ( talk) 18:56, 13 March 2008 (UTC)
Where on Earth is the stuff about Prussian Blue and the Holocaust as the poster above mentioned? —Preceding unsigned comment added by 86.128.148.9 ( talk) 21:29, 27 May 2008 (UTC)
I'm seeing a big chunk of whitespace next to the chemistry infobox, and the text of the article begins only next to the color infobox. I had a look at the page source but couldn't figure out what was causing that. Would someone who understands formatting better than I do take a look at that? (I'm on IE 6.0, WinXP). Chuck ( talk) 21:01, 5 June 2008 (UTC)
The text regarding "New Cyanotype" ("New Cyanotype, [...] gives increased tonal range and reduces exposure times.") seems to be poorly done and misplaced:
1. It should be relocated to the "Cyanotype" article, as it is a modification of the cyanotype process and has little to do with Prussian Blue per se.
2. The external link should be to the page that gives the New Cyanotype process ( http://www.mikeware.co.uk/mikeware/New_Cyanotype_Process.html), not to the main page of the site ( http://www.mikeware.co.uk/), which has no information on the process.
3. The sentence does not fit with the flow of the text and is not adjacent to the one other sentence in the article regarding cyanotypes.
4. That sentence was added in an edit that made no other change, attributed to IP addr 62.56.118.116.
Indeed, looking at the External Links section of "Cyanotype", I see a link to New Cyanotype which has these problems corrected.
Hence, I am undoing the change that added this sentence. DWorley ( talk) 20:00, 2 August 2009 (UTC)
I'm going to add the Prussian blue assay for total phenols Jasoninkid ( talk) 15:25, 19 December 2009 (UTC)
The sentence "It is insoluble, but the crystallites tend to form a colloid." is nonsensical since no (class of) solvent is specified. -- Belg4mit ( talk) 02:28, 26 April 2011 (UTC)
Should the article have information about Crayola renaming their "Prussian Blue" color? It's trivia but relevant. 99.236.208.169 ( talk) 17:21, 2 October 2011 (UTC)
Before men knew how to make cyanide, how was Prussian blue made? What ingredients and how were they treated? Anthony Appleyard ( talk) 06:12, 29 January 2012 (UTC)
Towards the end of the Medical Uses section it indicates Prussian Blue has been removed from the US markets because safer medications are available. The citation is pending.
I would like to point out the following government FDA link that was pointed to via a link through the CDC link, I provided both below, that indicate this may be false. http://www.fda.gov/Drugs/EmergencyPreparedness/BioterrorismandDrugPreparedness/ucm130337.htm
http://emergency.cdc.gov/radiation/prussianblue.asp
The FDA link was last updated in 2011 and the CDC page was last updated on 2014.
Additionally, if you look at the FDA link (dated Jan 2015) for Ca- DTPA and Zn-DTPA ( a different treatment) you will find the following question/answer;
10. How does this relate to FDA’s previous findings that Prussian blue may be safe and efficacious for people internally contaminated with radioactive materials?
Both Prussian blue and the DTPA products are drugs intended to enhance the elimination of radioactive materials from the body. The drugs differ in chemical composition, routes of administration, side effects, and types of radioactive materials that they eliminate from the body. Prussian blue is administered by mouth while the DTPA products are injected in the blood stream or inhaled. The main side effects of Prussian blue are constipation and upset stomach. The main side effect of the DTPA products, especially Ca-DTPA, is a decrease in levels of certain essential nutritional metals. Prussian blue remains in the intestine and binds radioactive cesium and thallium. DTPA products circulate through the blood stream and bind radioactive transuranium elements (i.e., plutonium, americium, curium).
http://www.fda.gov/Drugs/EmergencyPreparedness/BioterrorismandDrugPreparedness/ucm130314 Found via http://www.fda.gov/Drugs/EmergencyPreparedness/BioterrorismandDrugPreparedness/ucm063807.htm Dated Feb 2014
I could find no statement that Prussian Blue has been removed from the market in the USA or elsewhere.
I would recommend that statement be removed unless a current citation can be found. Thanks!
72.128.208.82 (
talk)
22:13, 13 September 2015 (UTC)
I think that there should be a reference to Bob Ross' use of this color oil paint in his TV show, The Joy of Painting. It's a well-known program, and not just a "cheezy US? TV ref" as Smokefoot wrote in their undo. If not in the body of the article, it should be included under See Also. Hameltion ( talk) 23:57, 21 May 2017 (UTC)
I suspect that any modern artist who uses dark blue uses PB, but would need to verify. -- Smokefoot ( talk) 00:45, 22 May 2017 (UTC)
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You want a list of everyone who dyed with Prussian blue?-- Smokefoot ( talk) 12:13, 10 January 2019 (UTC)
There's currently a move discussion at Talk:Prussian Blue#Requested move 22 January 2019. While it doesn't directly affect this article, it may be of interest to those who watch here. 62.165.227.102 ( talk) 11:05, 23 January 2019 (UTC)
I know this is a complicated topic, so it'd be good to get other views before I add anything inaccurate to this article. I've made some images of the structure of 'normal' and dehydrated Prussian blue based on the 1980 neutron diffraction study:
I personally find a text description of the structure hard to make sense of without some kind of image to enhance it, even if the image cannot show every subtlety. Is there a way we could incorporate these, or similar, images into the article?
Ben ( talk) 13:18, 7 February 2021 (UTC)
Thanks Smokefoot, really helpful thoughts. I have no special attachment to the dehydrated structure, so it's probably easier to leave it out than pick one component of the disorder. Glad to hear the hydrated structure is reasonable. Is there any value in starting with simplified models and building the reader up to the complex, disordered reality? If so, the following may help:
Ben ( talk) 16:47, 7 February 2021 (UTC)
.-- Smokefoot ( talk) 17:01, 7 February 2021 (UTC)
Looks great! I've just added a selection. Many thanks. -- Ben ( talk) 18:55, 7 February 2021 (UTC)