Talk:Mordant

message: I was just watching season 1, episode 2, of Rough Science, and it says that urine can also be used as a mordant.
I got it wrong. I finished watching the episode, and they tried 3 different liquids for mordants. Turns out boiled urine didn't work afterall. I can't recall what they did end up using. — Preceding unsigned comment added by 59.167.171.207 (talk) 30 July 2006
:Urine is part of an affixed stain. Indigo, I think, but don't ask me for the whole process. Brewhaha@edmc.net 09:08, 6 August 2007 (UTC)
replies: text: fixative is a synonym, much as in photography. Hmmm. Dye sublimation might be relevant, too. Mordants affix stains. IOW, Mr. Stuart's blueing (potassium ferrocyanate) can be affixed by sodium hypochlorite (bleach). In photography, the mordant removes part of the stain, but there's also a fixation step. Brewhaha@edmc.net 09:07, 6 August 2007 (UTC)

text: I think that's off topic. pyrotechnics and stains are quite different.Brewhaha@edmc.net 09:07, 6 August 2007 (UTC)

message: *Disagree.  We need a longer article specifically on mordants used in dyeing textiles; perhaps what is currently there could be moved to a disambiguation page and the article on dyeing could live at mordant? - PKM 19:46, 6 August 2007 (UTC)
replies: text: Would have agreed, but seems pointless at this late date. However did create a Dye fixative redirect page to this article today. FrankB 20:05, 13 September 2016 (UTC)
thread_title: Proposed merger of [[mordant]] into [[fixative]]

message: The text says that all mordants are polyvalent metals, yet lists sodium chloride as one possibility
174.114.48.103 (talk) 07:22, 14 May 2010 (UTC)
thread_title:  inconsistency 

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thread_title:  External links modified 

message: re: Section mordant#Mordants in history
Added a  template in the section on history, also just started with the first such entry.
;Rationale:I know from reading on Industrial history, there were a number of such chemicals with interesting historical footnotes. Such tales belong here, so those of you in a chemical industry or science, dig some of these up and document the same. // FrankB 20:11, 13 September 2016 (UTC)
thread_title:  Mordants in history needed 

message: The Mordant#Silk section is difficult to understand, and it seems to spend more words on wool than on silk.
Here's how I understood it, but I might be wrong:
* "Like wool, silk is also amphoteric and can absorb both acids as well as bases." OK, both are the same in this respect.
* "However, wool has thio groups (-SH) from the cystine amino acid, which act as reducing agent and can reduce hexavalent chromium of potassium dichromate to trivalent form." This describes wool but does not say whether silk likewise has thio groups.
* "The trivalent chromium forms the complex with the fibre and dye." I figure the complex is what keeps the dye attached to the fibre, i.e. it is desirable. Then it must mean potassium dichromate is an effective mordant on wool, thanks to the thio groups.
* "Therefore, potassium dichromate cannot be used effectively as mordant." Here it says the opposite though. Perhaps this last sentence refers to silk rather than wool. In that case, it should say so.
It would be good to list a reference for those thio groups and their role in dyeing, too.  2001:14BB:140:6FA2:B8C0:307F:5663:E476 (talk) 00:15, 20 November 2016 (UTC)
thread_title:  silk vs. wool, thio groups