Re: "...like the red cabbage trick with vinegar"....
Posted by Catherine Cartwright Jones on October 10, 2001 at 17:24:49:
In reply to: "...like the red cabbage trick with vinegar".... posted by Silvia on October 10, 2001 at 04:49:26:
: Please explain this.Red cabbage and some other natural acidic dyes will change color with
ph.
If you chop up a red cabbage leaf in vinegar, it'll stay pink.
If you chop up a red cabbage leaf in ammonia, it'll go green.
If you rinse off all the ammonia and put that back in vinegar, it'll
go pink again.
I don't think that's what's happening with henna, because I haven't
been able to reverse the color back after the ammonia trick. I think
with henna the molecule is percipitated, and percipitates are stable
and won't reverse back.
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