To make slime with hand soap, you can follow these steps:
1. Mix 1 part soap flakes with 3 parts warm water. There is no science to making slime, so your measurements don’t have to be exact. For a simple batch of slime, start with 1 cup (38 g) of soap flakes and 3 cups (700 mL) of warm water. Stir everything together with a spoon until the soap dissolves.
2. Beat the mixture with a whisk or an electric beater until it gets frothy and slimy.
3. Stir in 3-5 drops of food coloring and start playing with your slime! Store it in an airtight container to make it last.
You can also add liquid starch to your mixture to thicken it and make it more like traditional slime. Another recipe suggests adding 3 pumps of foaming hand soap and small amounts of liquid starch at a time until it thickens and becomes the consistency of slime you desire.
I hope this helps!
