Re: Henna Testing - a proposed method of working.


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Posted by The Henna Works on October 12, 2002 at 15:36:39:

In reply to: Re: Henna Testing - a proposed method of working. posted by Catherine Cartwright Jones on October 12, 2002 at 12:06:33:

: All your suggestions certainly seem reasonable to me and I"m happy
to
: work with you on them. They're pretty much what I've been doing.
: I"ve been very careful about cross contamination, labeling and all.
:
: I would suggest we use bottled lemon juice rather than water .....
: except for samples presumed to be indigo.


It seems that using bottled lemon juice could possibly be a source of
cross contamination. Every bottled lemon juice that we have used has
some sort of pulp or other sediment(s) in it. Therefore, adding this
to the test subject could contaminate it with larger particles,
whether it be vegetable matter, or who-knows-what. It stands to
reason that this can be eliminated all together by using bottled,
distilled water.

Also, we wonder if the "method of mixing" would affect the way the
paste looks under a microscope. For example, you wrote that samples
were mixed and allowed to sit for 20 minutes before being applied to
the slide.
In our experience, 20 minutes does not allow for sufficient wetting
of the henna powder, leaving it somewhat lumpy. Would these slightly
drier lumps then feel "gritty" or appear as larger particles under a
microscope?
Letting the mixture sit for 24 hours would assure that all of the
powder has had ample time to become "wet".

We have other questions as well, however we feel that these stated
issues carry greater importance, pertaining to unbiased testing
procedures.

 


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