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Jani Henna
The henna in this picture is from Jani Henna;  http://www.janikone.com , 
Muhammad Younus Karawadia,  Younus Abdullah & Co. Karachi - Pakistan,   Muhammad Younus Karawadia <karwadia@inet.com.pk>
I used their henna powder, which comes in a package with a packet  of citric acid and a packet of terpinol. 

I mixed the henna with lemon juice at 5 pm and  added the terpinol at 8 pm and began and applying it to my foot. The application was finished by 10 pm.   I sealed the henna down with New Skin, and slept overnight with my foot lightly wrapped.  At 6 am, I began to remove the paste...... and the results were beautiful and suprising!

The henna color was deep rosewood-walnut color directly under the paste!  The terpinol had already done the darkening oxidation that normally takes 2 days to complete.  Usually, the stain is orange when the henna is removed, and gradually darkens to its maximum color, but the terpinol had totally changed that!  The henna stain darkened only very slightly over the next 2 days.  The color did not demise  at all during the next week!

The next suprise was that the henna stain on the top of my foot was EXACTLY the same color as that on the sole of my foot.  That, in my experience, is absolutely unheard of!  Skin cells on the top of the foot are different from those on the sole, and there is normally a big difference in stain color from top to bottom of the foot.  However, the terpinol had stained perfectly evenly over both!

Therefore, in this test, Jani with terpinol was shown to give outstanding henna stains that were unusually even on all parts of the foot, and which did not require time to mature!

More about the effect of terpines on Jani and other hennaes:

As the stain exfoliated, there were more suprises:  There was NO significant "wuss-pumpkin" phase! The stain was oxidized rosewood brown down to the next to the last layer! 

The last suprise .... the stain was very, very brief!  At day 14, only 15% of the design remains on the sole of my foot!.  Normally, stains last 8 weeks on my sole.  The stain on the top of the foot has also vanished quickly. 

Either the terpinol prevents the henna from penetrating as deeply as usual, or the terpinol makes the skin exfoliate more quickly than usual.

I had used Jani henna previously without terpinol previously and had entirely different results.  The stain, without terpinol was within the range of normal henna behaviour.  Terpinol has a dramatic effect on the stain color and demise of henna!

The color with terpinol is one that I've seen many times before in pre-mix hennaes.  It is quite similar to the odd "redwood-walnut" color of Earth Henna, Mehndi Mud and several pastes.  Those products leave a stain that is also known for unususally fast demise. 
 

Many essential oils have high terpine contents: pine needle oil is very high, and tea tree oil has 35% terpine content.  I mixed tea tree oil into henna on a subsequent experiment and got a very similar effect in that batch: highly oxidized color, of an unusual rosewood-walnut tone, and even color on front and back of a hand, and an unusually fast demise.

So ...... if you want to do a forearm to hand design and have the color be relatively even .... mix your henna with terpinol, or an oil that has a high terpine content!

The terpinol has a strong pine-sol sort of scent.  It was fairly pleasant in the henna .   The Tea Tree oil left a "athlete's foot treatment medicinal smell" on the hand that persisted for 3 days. 

At present, I haven't checked out toxicities and allergy problems with terpines.  I will link information here as I have it.  Terpinol is a pine derivitive, and is used in the perfume industry.  When less refined, it is a paint stripper.  Terpines, generally, are in many essential oils in different quantities. It is present in frankincense, tea tree oil, pine needle oil, and many other oils that have been observed to oxidize (darken) henna stains.  

Interesting!

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for useful henna gear that's hard to find
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