The more body wash you use, the more slime you will make.
If you choose to use more or less body wash, use the more or less shaving cream to keep the 1:1 ratio for consistent texture.
You can color the slime by adding food coloring to the body wash. [8] X Research source
If you want to color the oobleck, add food coloring to the water before mixing it with the cornstarch. It’s also possible to make oobleck without cornstarch.