I had a cotton sweater that I wanted a different color. (It was raspberry.) I soaked it in dye remover and it turned a strange yellow-ish color. Turns out it had first been treated with something which would make the raspberry color more vibrant. Or something along those lines. Anyway, I never could get it to an uncolored state.
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ann Catelli Sent: Wednesday, August 29, 2007 6:00 PM To: Historical Costume Subject: [h-cost] Indigo Re: questions about linen and dyes --- [EMAIL PROTECTED] wrote: > The blue-->brown with bleach issue has me wondering if your blue is > actually indigo, which (I believe, unless I have things > backwards) turns yellow in basic > solutions and blue again in acids. That might also explain why it's > so very hard to remove. Try dipping your brown swatch in vinegar to > return it to blue? > If it works, you know you've got indigo (or a synthetic version of > the same > chemical) and could do research from there. > > Emma Indigotin is not an indicator. The indigo dye bath is basic, and is yellow, but that's from the reduced form of indigo, indoxyl, where blue is the oxidized form. I'm not sure what's going on with the brown, except further chemical reactions--there are several chemicals with common names of [color] indigo, per an old CRC Handbook via my faulty memory. i.e., red indigo, brown indigo, and blue indigo. While looking up some indigo chemistry to supplement said faulty memory, I came across an interesting page <http://www.indigopage.com/chemistry.htm>, which show the Tyrian purple molecule as found in the Murex species--it is 6,6'-Dibromoindigo. Only two bromines away from indigo! But nothing to supplement the [color] indigo list in my immediate search. Ann in CT ____________________________________________________________________________ ________ Shape Yahoo! in your own image. Join our Network Research Panel today! http://surveylink.yahoo.com/gmrs/yahoo_panel_invite.asp?a=7 _______________________________________________ h-costume mailing list [email protected] http://mail.indra.com/mailman/listinfo/h-costume _______________________________________________ h-costume mailing list [email protected] http://mail.indra.com/mailman/listinfo/h-costume
