I found an interesting statement about tannins and trace amounts of iron in essential oils.

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Posted by Faery Ring on August 23, 2001 at 21:53:59:

I found this interesting statement on The Good Scents Company web
site under the description of IMMORTELLE ABSOLUTE (HELICHRYSUM
ANGUSTIFOLIUM).

http://www.execpc.com/~goodscnt//index.html

“As a peculiarity, it should be mentioned that Absolute of Immortelle
usually contains significant amounts of tannin, a material rarely
found in flower extracts. Tannin is liable to discolor in contact
with iron and other metals which are present in trace amounts in many
essential oils, etc”

Do you think that the trace metals that exist in the essential oils
can also help to darken henna? Perhaps the iron is helping to
oxidize the hennotannic acids?

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Perhaps more relevant to fiber arts than skin Catherine Cartwright Jones 22:16:38 8/23/2001 (7)
- Trace amounts of metal can be dissolved in solution. Faery Ring 23:09:36 8/23/2001 (6)
  - maybe its already there! Catherine Cartwright JOnes 23:41:41 8/23/2001 (5)
    - Re: maybe its already there! Lisa K 04:01:31 8/24/2001 (3)
      - Re: maybe its already there! Catherine Cartwright Jones 04:36:57 8/24/2001 (2)
        
        Forgive the typos o/t Catherine Cartwright Jones 04:42:37 8/24/2001 (1)
        
        Re: Forgive the typos o/t Jolynn 05:12:47 8/24/2001 (0)
    - I heard that henna grown in iron rich soils stain darker too. Faery Ring 01:03:10 8/24/2001 (0)

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: I found this interesting statement on The Good Scents Company web : site under the description of IMMORTELLE ABSOLUTE (HELICHRYSUM : ANGUSTIFOLIUM). : : http://www.execpc.com/~goodscnt//index.html : : “As a peculiarity, it should be mentioned that Absolute of Immortelle : usually contains significant amounts of tannin, a material rarely : found in flower extracts. Tannin is liable to discolor in contact : with iron and other metals which are present in trace amounts in many : essential oils, etc” : : Do you think that the trace metals that exist in the essential oils : can also help to darken henna? Perhaps the iron is helping to : oxidize the hennotannic acids?
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