Re: Henna Testing - a proposed method of working.
Posted by Maureen on October 12, 2002 at 17:18:33:
controls along the steps of testing.
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 from
suppliers and anyone else who decides to send in a sample. I believe
he is referring to each and every sample being provided by the
supplier or source of origin of the henna powder. That I can agree
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.
The water or vinegar suggestion seems very important to me. So does
the 24 hour waiting period. Perhaps there will be a need for two
separate batches. One for looking for the dyes which occurs within a
certain and defined timeframe and another for looking at the
consistency of the paste...the 24 hours.
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 objectively
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. The
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 out
from the henna powder. Is it sufficient to say "dye present?" I
would think so. But others may not.
I would also like to have a piece written up about the scope, depth
and methodology of the entire process so that can be held constant.
It might also be important to suppliers participating to indicate how
long the testing will go on. And people commit to the length of time
that seems reasonable and real to them. Or have a set length of time
that people are asked to commit to and if they can't commit to it for
whatever reason, that be honored.
With a list such as this, I have some problems with the conclusions
that get drawn by either the creator of the list or those who sent in
samples. It appears to me that the list will stand for itself if the
methodology is what it needs to be. I trust people to draw their own
conclusions without suggestions one way or the other from people
invested in the list about what it means. So I guess I would also
like to see in some written form just as the research design and
methdology would be in written form: What the assumptions are...the
limitations of the document (what it can or can not tell you...should
or should not be used for). This would be helpful to keep responses
in proportion to what the list actually can and can not prove.
There are other things mentioned that I wanted to comment on but
can't remember what they are right now. Another time.
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