Did the package say anything about "indigofera tinctoria" ? I'm familiar w/ the 1st brand, but only as a red henna. If neither had the word "indigofera tinctoria"...forget about it. You might be getting PPD which ain't good.
The one "store brand" of "black henna" I recommend is "Zarqua" brand it's green w/ a woman on the box showing off her lovely black tresses and it's country of origin is Pakistan. If you're going to buy it in the store, by this brand.
Platinum...here's my general rule, when I go to the Indian store I almost never buy a "Made In India" brand, I go for the "Made In Pakistan" brands because they usually don't tamper w/ the product. You get what you're paying for. Since the stores always carry a least a few brands, you can try out my system. Jamila is a Pakistani product and you can't go wrong w/ them or w/ Zarqua.