Failing a spectrophotometer you may have to just experiment with it.

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Posted by Faery Ring on September 5, 2001 at 17:14:19:

In reply to: the perfect never fail mix? posted by Graeme on September 5, 2001 at 15:21:40:

I use a good portion of the henna powder testing what works then
stick to it. Apart from the right recipe I think that an important
piece of information is how long it takes for the paste to ‘ripen’ so
to speak. The way I determine this is by mixing up the acidic liquid
with the henna powder in a plastic bag. Then I place the plastic bag
inside a small plastic butter tub lined with a sheet of white facial
tissue. Then I check to see how long it takes to stain the sheet of
tissue a bright orange color. Then I use the henna paste to check
how well it stains. This will give you a pretty good gauge of how
long it will take and it will not change assuming you are using the
same batch of henna powder and keep the temperature the same. Then
the next part is to test the oils that you add to the mix and how
they affect the stain. Mix up a plain batch and let it sit for the
number of hours that you have previously determined. Then divide up
the henna paste into different containers or carrot bags. Then add
the same amount of oil into each batch. Then test it by doing side-
by-side comparisons. Keep in mind when you added the oils because
it’s a good idea to test the paste mix 6, 12, and 24 hours later.
That will help to determine when the peak and the demise of the henna
paste with the essential oils. Once I have determined the time it
takes to ‘ripen’, the right essential oils, and the time it takes for
the terpine-enhanced paste to ‘ripen’ I don’t get a lot of strange
results. I must admit that I don’t measure and I should do it, as it
would really help to get more consistent results.

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: I use a good portion of the henna powder testing what works then : stick to it. Apart from the right recipe I think that an important : piece of information is how long it takes for the paste to ‘ripen’ so : to speak. The way I determine this is by mixing up the acidic liquid : with the henna powder in a plastic bag. Then I place the plastic bag : inside a small plastic butter tub lined with a sheet of white facial : tissue. Then I check to see how long it takes to stain the sheet of : tissue a bright orange color. Then I use the henna paste to check : how well it stains. This will give you a pretty good gauge of how : long it will take and it will not change assuming you are using the : same batch of henna powder and keep the temperature the same. Then : the next part is to test the oils that you add to the mix and how : they affect the stain. Mix up a plain batch and let it sit for the : number of hours that you have previously determined. Then divide up : the henna paste into different containers or carrot bags. Then add : the same amount of oil into each batch. Then test it by doing side- : by-side comparisons. Keep in mind when you added the oils because : it’s a good idea to test the paste mix 6, 12, and 24 hours later. : That will help to determine when the peak and the demise of the henna : paste with the essential oils. Once I have determined the time it : takes to ‘ripen’, the right essential oils, and the time it takes for : the terpine-enhanced paste to ‘ripen’ I don’t get a lot of strange : results. I must admit that I don’t measure and I should do it, as it : would really help to get more consistent results.
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