--- [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
