I did some covers myself! I had acquired a large collection of backs before trying, and these are my results.
-The black one with the liquid black dye, took about 1/3rd of the bottle and maybe 15 minutes
-The gold was a fun one. A whole package of Golden Yellow power dye, about 15 minutes as well. This one came out very unique and I like it. Looks much better in person
-Blue was royal blue power, NOT MUCH POWDER and literally took about 4 minutes to get it to this color and I pulled it. I originally tried and left it in about 10 minutes and it looked too purple, so I just went ahead and made it black.
-Red was Scarlet liquid dye. Took about 10-15 minutes. Really like this one.
-OEM one for comparison. It has a crack in the camera lens, so didn't want to dye this one.
In all cases, I had the water on a "4.5" out of 12 options for heat on my stove. I started with hot water from the faucet and let it get hot enough to let my fingers sit in there a few seconds without feeling pain.
