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


“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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