In any case, we have a cotton fiber that initially looked like a 'C', that now looks like an '0', which opens up a lot more surface area for dye to get into the fibers. And now fascinates me even more. The more favorable path involves single proton transfer followed by a trans to cis isomerization and a second proton transfer. Sodium chloride exhibits ionic bonding. However, it was observed that the equilibrium between radical, indigo and leucoindigo is shifted to the radical side with higher pH. is available on our Permission Requests page. rev 2020.11.24.38066, The best answers are voted up and rise to the top, Chemistry Stack Exchange works best with JavaScript enabled, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, Learn more about hiring developers or posting ads with us. do not need to formally request permission to reproduce material contained in this There is a ton that goes into the dye chemistry of this system, and a ton that goes into the cotton processing (which I'm still not 100% on), so I'm sure I made some oversimplifications somewhere along the line. MAINTENANCE WARNING: Possible downtime early morning Dec 2/4/9 UTC (8:30PM…, “Question closed” notifications experiment results and graduation. Also, how would one go about explaining the common knowledge that water slows the rate of fading in a chemical sense? It is used in the United States mainly for dyeing cotton for work clothes; for a long Huh. Anyway, a very interesting write-up! miquel.moreno@uab.cat, b If you are the author of this article you still need to obtain permission to reproduce Not only that, but the molecule itself is quite symmetric, with oppositely oriented polar bonds, that cancel out each others' dipole moments. Asking for help, clarification, or responding to other answers. Metallic sodium, for example, has one valence electron in its…. Black and white races are equal - in the New Testament? And this came out of my writing a piece on vinegar washes actually. Chemistry Stack Exchange is a question and answer site for scientists, academics, teachers, and students in the field of chemistry. Where should small utility programs store their preferences? I was aware of it's symmetry, it's just the hydrogen bonding that puzzled me, thank you. Indigo was known to the ancients of Asia, Egypt, Greece, Rome, Britain, and Peru. As a chemistry nerd, you just gave me indigo balls. 9, 60438 Frankfurt am Main, Germany, Institut de Biotecnologia i de Biomedicina, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain, Instructions for using Copyright Clearance Center page. Well, I hope that this was informative and enjoyable and not totally wrong. How do we know neutrons and electrons are distinct particles on the same scale as protons? So lots of potential surface area for indigo to stick too. I don't know much about cultivation, but I would suspect that cotton grows better in some fashion, but I can't debate that. Experiments yield information about the reaction mechanism and the kinetics, and they show the possibility of this new route for production of water-soluble indigo, which offers tremendous environmental benefits. Sign Android APK. Our results point to a very different photochemistry of the two molecules. Indigo belongs to a family of dyes called vat dyes, which are a classification of dyes that you can't just mix with water and dip stuff in but you have to chemically alter with additions of other stuff in a vat to change the properties of the dye itself.This change is needed to get indigo in solution where diffusion can get the dye into all the nooks and crannies within the cotton fibers. Can the President of the United States pardon proactively? Perhaps the geometry isn't right? https://www.britannica.com/technology/leucoindigo. Other articles where Leucoindigo is discussed: dye: Vat dyeing: …to a soluble, colourless form, leucoindigo. By signing up for this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica.
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