Now when I do use Jamila, I let it sit for 3 hours and put it on my hair overnight with my head covered in a turban of cling wrap. In the morning, I rinse it out with water only (I use a wide toothed plastic comb to help get the pieces out) and I actually use the Cocoveda oil from Henna Sooq as a leave in conditioner.
http://hennablogspot.com/confused-henna-results/
If you’re in a hurry and don’t want your henna to go brassy, put your henna mix in the car, in the. sun, with the windows rolled up, or some other place that’s 100F to 140F, 37 to 60 C. Check. your paste in one hour for dye release. Do not put your henna paste in the oven or microwave; ovens heat the paste unevenly. Henna on a warm day, 80F or 26 C. If you have a warm room or on a warm day, 80F or 26 C, mix your henna in the morning and it. will be ready in the afternoon or evening. If you can’t use it twelve hours after you mixed it, cover the paste and put it in your refrigerator or freezer, to save it for later.
http://tapdancinglizard.com/AS_henna_for_hair/chapters/chap7/7_dye-release.pdf
I usually order BAQ henna from Tap Dancing Lizard off the Henna for Hair website and have never had any problems with dye release. I’ve made two batches with the Jamila and the first did not have any discernible dye release for six to ten hours. I ran out of time by 12 hours and put it on for a couple of hours.
http://hennablogspot.com/confused-henna-results/
The Developing Process. 1  The Colour of your Henna Tattoo will begin to darken immediately. 2  It will gradually darken over the next 12 – 48 hours.  Your skin type dictates the specific development time, some people’s Henna Tattoos reach their best colour in the first 12 hours, whilst others can take up to 2 days.
http://www.hennatattoos.com/how-henna-works/
1 Once the Henna Paste comes into contact with your skin the dye starts to work and begins to stain the skin.The Henna Paste needs to stay on the skin for 2 hours to make sure the skin takes on a good colour.  After 2 hours you can remove the Henna paste by brushing it off, you will see an orange coloured design.
http://www.hennatattoos.com/how-henna-works/
1 After 2 hours you can remove the Henna paste by brushing it off, you will see an orange coloured design. You must not wash it or get it wet at this stage. 2  The Colour of your Henna Tattoo will begin to darken immediately.  It will gradually darken over the next 12 – 48 hours.
http://www.hennatattoos.com/how-henna-works/
Second you left your henna sit for 12 hours and Jamila has a fast dye release this year. It only needs 3-4 hours for hair use, and then you should use it for best results by that time frame. You can email us at info@hennasooq.com for further assistance. I hope this helps!
http://hennablogspot.com/confused-henna-results/
I have to cover gray every 2 weeks. I only do roots for covering gray. My hair is more than 50% gray and long- 8 inches below my shoulders. I have been using Henna for 10 years. 5 years from India, now 5 years Rainbow Henna from Vitacost.com. (I used semi permanent hair coloring for 10 years prior). I mix 2 colors and add 2 Tablespoons of vinegar to the mix and use coffee instead of water for the liquid.
http://detoxinista.com/2012/08/6-things-you-should-know-before-using-henna-hair-dye/
After this I rinse it out but to my dismay I did not receive any color deposit. Discouraged I decided at 11pm last night to make another batch and since it was BAQ henna to do the 12 hour overnight wait. So I mix another batch, let sit for 12hrs.
http://hennablogspot.com/confused-henna-results/
1 The Colour of your Henna Tattoo will begin to darken immediately. 2  It will gradually darken over the next 12 – 48 hours.  Your skin type dictates the specific development time, some people’s Henna Tattoos reach their best colour in the first 12 hours, whilst others can take up to 2 days.
http://www.hennatattoos.com/how-henna-works/
how long does henna have to sit for for color to work
Henna has to sit 12 hours, for color to work. For colors to work, henna has to sit for 12 hours.