How to dye a white ABS puzzle black with Rit dye and acetone

Using black Rit dye, hot water, and acetone I dye a white Helicopter Cube black. The final solution was about 25% acetone and I use a full pack (32 grams) of Rit dye. A video of the results is at the end.
You can buy both Rit dye and Acetone on Amazon.