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Why just an empirical formula, which is of little interest? I don't know that we need a structure diagram (tho i dare say we could get one drawn for the article), but even if it's one of those multi-ring structures where an "edge" is shared between two ring polygons (something that i'm not sure i could grasp in a structural formula) it shouldn't be that cryptic to count the rings and specify their individual structures. -- Jerzy (t) 05:00, 2005 Feb 9 (UTC)
The FD&C regulation lists CAS numbers for the different forms of indigotine that are allowed in food, but when I tried to find them, all except for 860-22-0 drew a blank. What is going on here? Did the FDA screw up here, have the numbers changed, or does PubChem just not have the others? Here is the quotation from the page:
Also, I will be adding a section on the food use of the dye here. -- Slashme 07:36, 23 December 2005 (UTC)
That same link from the FDA says specifically that FD&C Blue No. 2 (the above mixture) is obtained by sulfonation of indigo dye - i.e. indigo carmine. these are distinct compounds; this should be corrected. looks like there are a few different compounds and mixtures we should distinguish here; the plant extract, the synthetic mixture, and the sulfonated versions thereof. 66.253.2.98 ( talk) 21:24, 13 May 2009 (UTC)
Can someone tell me why my edit in this section was removed which was "In literature, the drama NIldarpan (the blue mirror ) by Dinabandhu Mitra is based on the indigo slavery and forceful cultivation of indigo (nil ) in India. It played an essential part in so called indigo revolt (nil bidraha ).Often this work is compared to Uncle toms cabin." ? Dinabandhu Mitra's drama nildarpan was very essential in what is called the indigo revolution in Bengal. Calling it substandard or unknown only shows the closedness of mind. Jeroje 03:29, 19 July 2007 (UTC)jeroje
Surely the history section can be broken up into subsections, I will be glad to help. Jeroje 04:19, 23 July 2007 (UTC)jeroje
Perhaps readers could be told of the comment of the Father of American Psychiatry, Benjamin Rush, who, when discussing the effect of odours on mental illness on page 32 of his book, Medical Inquiries and Observations upon the Diseases of the Mind (1812) said: "From among many other facts that might be mentioned, to show the connection of odours with a morbid state of mind, I shall mention one more. An ingeneous dyer, in this city, informed me that he often observed the men who were employed in dying blue of which colour indigo is the basis, to become peevish, and low spirited, and never even to hum a tune, while engaged at their work." -Chris Brown, http://ages.ca
—Preceding unsigned comment added by 216.106.110.100 ( talk) 16:59, August 25, 2007 (UTC)
In music the term “blues” originally derived from the fact that persons turn the color blue when they are poisoned to death with cyanide. The music term “swing” originally derived from lynching. The term “rock and roll” originally referred to hitting someone over the head with a rock and stealing their bankroll. I have no published source for this; take it anyway you like. Joni Mitchell’s song “Blue” makes light reference to the original meaning of “the blues”. This has little to do with dying cloth. But that is how the term originated. My Flatley ( talk) 23:59, 29 November 2010 (UTC)
Does anyone happen to have a list of sweets containing Indigotine? —Preceding unsigned comment added by Leviathan207 ( talk • contribs) 21:55, 5 June 2008 (UTC)
In this edit a few paragraphs which seem reasonable at face value were removed without so much as an edit summary. Was it really bad copy? Was it incorrect? Was it POV? -- Slashme ( talk) 06:42, 12 August 2008 (UTC)
I am going to remove the following sentence in the history (classical antiquity) section:
"The Phoenicians were particularly famous for their mass production of these dyes in classical times, and gigantic mounds of the discarded seashells are still to be found near the ancient cities of Tyre and Sidon They so dominated production of the dye that it was often referred to as "Phoenician (or Tyrian) purple".[2]"
Tyrian purple was not made from the indigo plant, it was made from the murex snail. Even the chemical structure is a bit different. The Phoenicians were certainly famous for dye, just not dye made from indigo the plant.
AllGloryToTheHypnotoad ( talk) 22:12, 4 January 2009 (UTC)
This entry on indigo needs correcting, for example, indican is the precursor of indigo found in leaves; and not as stated in the second sentence. The entry also and needs updating - for example we now know how indigo was reduced and thus dissolved in the medieval woad vat, and there are more useful references than some of those provided. I agree with the suggestion that this entry be entitled indigo, and the other be entitled indigo (color). —Preceding unsigned comment added by Ymlaen ( talk • contribs) 15:17, 27 May 2009 (UTC)
What is the reference for this section? "The molecule absorbs light in the orange part of the spectrum (λmax = 602 nm)." seems to be incorrect, or at least inexact. The reference I have, J. Wouten and A. Verhecken, JSCD, 107, (1991), p266-269 has λmax = 613 nm, though I suspect it shifts in different solvents, pH etc. Rgbutler ( talk) 03:54, 21 April 2011 (UTC)
British time war 122.161.68.155 ( talk) 14:32, 14 May 2024 (UTC)
![]() | This ![]() It is of interest to the following WikiProjects: | |||||||||||||||||||||||||||||||||||
|
Why just an empirical formula, which is of little interest? I don't know that we need a structure diagram (tho i dare say we could get one drawn for the article), but even if it's one of those multi-ring structures where an "edge" is shared between two ring polygons (something that i'm not sure i could grasp in a structural formula) it shouldn't be that cryptic to count the rings and specify their individual structures. -- Jerzy (t) 05:00, 2005 Feb 9 (UTC)
The FD&C regulation lists CAS numbers for the different forms of indigotine that are allowed in food, but when I tried to find them, all except for 860-22-0 drew a blank. What is going on here? Did the FDA screw up here, have the numbers changed, or does PubChem just not have the others? Here is the quotation from the page:
Also, I will be adding a section on the food use of the dye here. -- Slashme 07:36, 23 December 2005 (UTC)
That same link from the FDA says specifically that FD&C Blue No. 2 (the above mixture) is obtained by sulfonation of indigo dye - i.e. indigo carmine. these are distinct compounds; this should be corrected. looks like there are a few different compounds and mixtures we should distinguish here; the plant extract, the synthetic mixture, and the sulfonated versions thereof. 66.253.2.98 ( talk) 21:24, 13 May 2009 (UTC)
Can someone tell me why my edit in this section was removed which was "In literature, the drama NIldarpan (the blue mirror ) by Dinabandhu Mitra is based on the indigo slavery and forceful cultivation of indigo (nil ) in India. It played an essential part in so called indigo revolt (nil bidraha ).Often this work is compared to Uncle toms cabin." ? Dinabandhu Mitra's drama nildarpan was very essential in what is called the indigo revolution in Bengal. Calling it substandard or unknown only shows the closedness of mind. Jeroje 03:29, 19 July 2007 (UTC)jeroje
Surely the history section can be broken up into subsections, I will be glad to help. Jeroje 04:19, 23 July 2007 (UTC)jeroje
Perhaps readers could be told of the comment of the Father of American Psychiatry, Benjamin Rush, who, when discussing the effect of odours on mental illness on page 32 of his book, Medical Inquiries and Observations upon the Diseases of the Mind (1812) said: "From among many other facts that might be mentioned, to show the connection of odours with a morbid state of mind, I shall mention one more. An ingeneous dyer, in this city, informed me that he often observed the men who were employed in dying blue of which colour indigo is the basis, to become peevish, and low spirited, and never even to hum a tune, while engaged at their work." -Chris Brown, http://ages.ca
—Preceding unsigned comment added by 216.106.110.100 ( talk) 16:59, August 25, 2007 (UTC)
In music the term “blues” originally derived from the fact that persons turn the color blue when they are poisoned to death with cyanide. The music term “swing” originally derived from lynching. The term “rock and roll” originally referred to hitting someone over the head with a rock and stealing their bankroll. I have no published source for this; take it anyway you like. Joni Mitchell’s song “Blue” makes light reference to the original meaning of “the blues”. This has little to do with dying cloth. But that is how the term originated. My Flatley ( talk) 23:59, 29 November 2010 (UTC)
Does anyone happen to have a list of sweets containing Indigotine? —Preceding unsigned comment added by Leviathan207 ( talk • contribs) 21:55, 5 June 2008 (UTC)
In this edit a few paragraphs which seem reasonable at face value were removed without so much as an edit summary. Was it really bad copy? Was it incorrect? Was it POV? -- Slashme ( talk) 06:42, 12 August 2008 (UTC)
I am going to remove the following sentence in the history (classical antiquity) section:
"The Phoenicians were particularly famous for their mass production of these dyes in classical times, and gigantic mounds of the discarded seashells are still to be found near the ancient cities of Tyre and Sidon They so dominated production of the dye that it was often referred to as "Phoenician (or Tyrian) purple".[2]"
Tyrian purple was not made from the indigo plant, it was made from the murex snail. Even the chemical structure is a bit different. The Phoenicians were certainly famous for dye, just not dye made from indigo the plant.
AllGloryToTheHypnotoad ( talk) 22:12, 4 January 2009 (UTC)
This entry on indigo needs correcting, for example, indican is the precursor of indigo found in leaves; and not as stated in the second sentence. The entry also and needs updating - for example we now know how indigo was reduced and thus dissolved in the medieval woad vat, and there are more useful references than some of those provided. I agree with the suggestion that this entry be entitled indigo, and the other be entitled indigo (color). —Preceding unsigned comment added by Ymlaen ( talk • contribs) 15:17, 27 May 2009 (UTC)
What is the reference for this section? "The molecule absorbs light in the orange part of the spectrum (λmax = 602 nm)." seems to be incorrect, or at least inexact. The reference I have, J. Wouten and A. Verhecken, JSCD, 107, (1991), p266-269 has λmax = 613 nm, though I suspect it shifts in different solvents, pH etc. Rgbutler ( talk) 03:54, 21 April 2011 (UTC)
British time war 122.161.68.155 ( talk) 14:32, 14 May 2024 (UTC)