After waiting about a day and a half for the dye to release, I tested the henna on my hand, and it stained an orange color, as the instructions had indicated. I used an applicator bottle that came with different sized tips, and after experimenting with the thickness and speed of the dye coming out of the tip, I initially chose one of the thicker applicator options, but felt the lines were still too fine, so I went for an even thicker one and from there just went for it freehand. Maybe a little risky, but it’s temporary and all for fun anyway.
The paint dried a dark greenish black color and looked really cool, but once the dried henna peeled off (all over the house, every time I bent over or brushed by something, oops), the end result was pretty light. To contrast, the henna I did on my hand was much darker and noticeable, perhaps because the skin on the palms is thinner/softer?