Caffeine has a pH of 6.9. While that's technically an acid, it's awfully close to neutral pH. Caffeine is, in addition, WHITE. Its presense or absense has nothing to do with the dyeing properties of tea or coffee or walnut hulls, for that matter.
The tannins are tan to brown, acidic, and the coloring agents in tea and coffee. Ann in CT --- Carolyn Kayta Barrows <[EMAIL PROTECTED]> wrote: > > >I don't think the caffeine has anything to do with > the tannin. > > I heard that caffeine was the acidic part of coffee > or tea, as tannin is with walnut husks. > > CarolynKayta Barrows __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com _______________________________________________ h-costume mailing list [email protected] http://mail.indra.com/mailman/listinfo/h-costume
