Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Distinguishing between natural henna and unsafe alternatives

I have not downloaded this article, but from the brief information given about it, I wonder if the author has distinguished between safe, natural henna and unsafe alternatives that contain PPD and other harmful additives. Natural henna, Lawsonia Inermis, is only in the most rare of cases harmful to the body. It is in fact good for the skin, antibacterial when used on nails, and acts as a natural sunblock. There are unfortunately products on the market that are not natural henna, but claim to be so, as well as tattoo artists who apply these products without any knowledge of the harm they cause. For more information on henna, see www.hennapage.com.