I recently tried out this product and everything I will disclose is every experience I have personally had with the product. Please read carefully and use this when using the product. I am no henna expert, just used a youtube step by step information guide on this same product given by someone who knows his/her stuff.
MATERIALS: Everything YOU WILL need is included. There are one or two things not exactly mentioned in either the instructions or list of materials. (The blue tip) Please check if you have any reactions or allergies to anything. The henna powder is good, the sugar/citric acid is better than I thought, the mordant liquid is nothing special - it's tap water, the eucalyptus oil is just that, and everything else is used to remove mistakes and to be used in application.
INSTRUCTIONS: The instruction manual misses information and leaves out different materials and how to use them. Also, don't let the paste sit for 45 minutes like instructed, just use it when possible.
APPLICATION: The bottle does not have a fine tip so be careful when applying the henna paste. (It should look green, not too bright)
RESULTS: It will last for awhile. The henna stain is not black, it's red. I left it on for quite awhile - hours - and it doesn't seem to get any darker but leave it on until the henna begins looking dull and cracked.
EXTRA TIPS: Do not use the applicator tip because it does not screw on properly to the cap and will fall off. Do not make the henna powder mixture too soggy or too dry.
Go to youtube > search "Jacquard Mehndi Henna Kit" > click a video that should pop up first and is around 30 mins long. It's really good and I recommend.
Overall, in my experience the instructions are not useful for beginners. I only survived with the video I saw. Be careful when applying. The product is good and you get what you paid for but you must do everything correctly. So buy it if you want red henna and minor difficulty with applying and following instructions. I made various tattoos, they come out good.