A few months ago I ran across this new sensory substance, Bubble Dough, over at Creative Playhouse, and I knew we had to try it! I started by mixing corn starch with dish soap. I just used the blue, Dawn dish soap, but I think any would work fine and give you different colors and scents. I didn’t measure, but I think I ended up using about 3 cups of cornstarch and 1 or 1.5 cups of dish soap; just mix the soap in a little at a time until you get the appropriate consistency (I am guessing different soaps require different amounts). Basically the dough goes through a crumbly stage where it is still mold able, but keep adding soap until it holds together. By this point you will probably need to knead it with your hands to get it mixed well.
Once I had my bubble dough, in a lovely blue color, I turned it over to the kids! They squished and pulled and squeezed. The dough is kind of like a very, very thick oobleck in that it will flow very slowly if allowed to sit, but will feel solid when pressure is applied.
In the end I think they enjoyed the bubbly oobleck part more then the actual bubble dough! They also had a great time getting washed off in the hose! In fact, this may have been their favorite sensory experience yet!