Does anyone know the difference between the Ancient Sunrise hair kits for gray and regular hair? Are they the same dye content and purity? I have henna'd 3 times with Rainbow henna (I didn't know about the Mehandi site when I bought it) but I don't feel it's 100% pure. My hair is dark brown with at least 50% gray. I love the new henna'd auburn "highlights" so I want to stay with a medium brown instead of something way too dark (I'm 48) for my age. My hair is very thin in the crown and I had been dyeing for 30 years. No more. Henna is all I will use now, so your help would be greatly appreciated.