Re: Henna Testing - a proposed method of working.

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Posted by Kenzi on October 12, 2002 at 17:29:42:

In reply to: Re: Henna Testing - a proposed method of working. posted by Maureen on October 12, 2002 at 17:18:33:

: For controlling the samples, Marks idea that they come from the
: suppliers would work fine with me. But I would want to know if
we are
: talking about coming exclusively from the suppliers or coming
: suppliers and anyone else who decides to send in a sample. I
: he is referring to each and every sample being provided by the
: supplier or source of origin of the henna powder. That I can
: with.

I think that it IS important to get samples of the same henna from
different sources...from different suppliers as well as from
clients who have bought it. I know that there are other suppliers
out there selling the same "brand" of henna from Morocco and
theirs came up in the test with more grit than other suppliers.
This may be something that happens in the handling between
the reseller and the client...the henna sitting out collecting dust,
dusty measuring and packaging instruments etc. It would be
important to know who has the cleanest version of any one
: Blind studies are good. But I don't know if they would be
: necessary. But if someone totally disconnected from this
process at
: all could be found to do it, it would just lead to further the
: validity of the testing and control of the samples. And that could
: only be a good thing.

I guess CCj is correct that blind or not, the slides tell the true
story of what a henna looks like.

: The ranking will certainly have to be worked out in a way that is
: measurable or should be abandoned until it can be measured.
What is
: a "lot" in terms of sand or grit" That can't be measured
: by sound. That would have to be counted and some value
placed on
: what impact 10 grits of sand or dirt has...30 grits...100 grits.
: same thing with the dye. How does one measure what is a
little or a
: lot. That would take an instrument that could separate the dye
: from the henna powder. Is it sufficient to say "dye present?" I
: would think so. But others may not.

That's a good point...I didn't think of that. Again, looking at the
slide will tell you what you need to know.


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