Hey everyone! Just got my Yemeni henna in the mail and already mixed up a little bit with lime juice and water for a strand test. So question 1: I used a black bowl, so how will I tell when the dye is released and it's ok to put on my strand?

And 2, any tips for arranging a large, chaotic hairball into a strand suited for testing so I can really scrutinize the color?

Thanks so much, you guys are the best!