They are somewhat time consuming as you can't let each layer cool too long nor can you pour the next layer on too soon or they will mix. The layers take varying amounts of time too because of the different thicknesses.
Typically I will scent all of the colors the same scent as getting the blending just right with this many layers would be very challenging. If that's your specialty, then go for it!
There may be other ways to do this but the way I learned is by using a tennis ball. The first thing you do is cut the tennis ball in half and clean out the inside. Other than that there is no prep needed.
I start out by choosing my colors and then mixing and scenting them all at once. Then, as I use each color, I reheat it, pour it, spritz with alcohol and wait. I find 10-20 minutes per layer is good. Sometimes I even feel it carefully to decide if its ready for the next layer.
Before pouring the next layer, I angle the ball haves by leaning them against something or tucking something under the edge just enough so the layers are at angles from each other. Don't forget to spritz the bottom layer with alcohol before you pour the next one or they will separate when they cool.
This continues until you have both sides filled to the top (a little over is ok too) and they are both ready for one last layer. Actually you only pour the last layer on one side but you will spritz both sides, pour one thin layer on one and then turn the other half on top to form the ball. You can either hold these this way or wrap a rubber band around them and allow to cool for several hours.
Removing the soap from the mold can be a bit tricky. If you aren't careful you will pry the halves apart when unmolding. The technique that has worked best for me so far is to hold the ball so that the seam runs through the middle, untouched. Kind of like you are holding the Earth by the poles and the equator runs round the middle. Then using your fingernails I'm not sure if a tool could be used here without damaging the soap; if you have insight into this, please leave a comment. I slowly work the edges all the way around on both sides of the seam and then pull progressively harder while maintaining the grip on the top and bottom of the mold until you can tell that the ball is ready to come out.
Any excess can be trimmed and a quick run under the sink will smooth out any minor flaws. There are so many options! Clear, solid, a mix of both. I have a goal to make one look just like a marble. Wish me luck!
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