Rainbow Soap Foam Bubbles Sensory Play by Rainbow Soap Foam Bubbles Sensory Play2 Tbsp of dish soap 1/4 cup water (please note if your tap water is especially hard or soft, you will need to substitute bottled water so that the soap will bubble well) a mixer food coloring or Colorations Liquid watercolors In a bowl, add 2 Tbsp of dish soap and 1/4 cup of water. Add food coloring or Colorations Liquid Watercolors (or Liquid Watercolors here) to the mix if desired. Mix on the highest possible setting for 1-2 minutes. Your foam should be able to form stiff peaks that hold their shape. Scoop it out into your container and repeat as necessary until you have the desired amount of foam!**Please note that we used liquid watercolors and had no staining as liquid watercolors are washable. If you use food coloring, you are very likely to have some staining as food coloring is not washable.**