How to Make Silly Putty | Science Projects

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You know what I like? I like inventions. I mean, think about it. A cell phone, that was an invention. It didn't exist 50 years ago. An air conditioner, that was an invention. A light bulb, that was an invention. But you see, all of those inventions, the person who created them had that idea in mind, and they were successful, but sometimes inventions are created accidentally. This experiment, actually was an accidental invention.

In the '40s, during World War II, America needed rubber. We just really needed a lot of rubber. And people were donating a lot of old tired but it just wasn't enough rubber. So what happened was, people were asked, scientists were asked, and engineers. Now engineers design stuff, right? Now they were asked to create a synthetic rubber. So a man went out, created a synthetic rubber, thought it was great, but unfortunately, it didn't have the properties that rubber needed to be.

Now remember, properties are things that you could describe something about. For instance, it's texture, it's size, it's hardness. Well, he had the synthetic rubber, and it just wasn't right. So what he did was, he kind of passed it around and gave to his friends and brought it to parties, and he became known as like, this nutty putty. It just caught on fire, and people loved it.

He then sold it as a children's toy. Maybe it wasn't practical at the time, but the end result was an accident. And here we are 60, 70 years later. People are still buying silly putty today. Now the cool part about it is, you do not need to go buy it when we can make it. Now some of you are going to say, 'Carmelo, we don't have these experiments at home. We don't have these materials at home,' but the reality is, you have most of the materials at home. And you probably are just going to have to buy one thing, for maybe, not even, $2. So this is experiment is going to cost you less than it would cost you to go buy it in a children's store. And you can make tons of it, enough to cover this entire table.

Now, watch this. All I need is water, water that I'm just going to fill up this container with. Okay? The material that you probably don't have, is this powder. Now you can find this in the laundry section in any grocery supermarket store. It's called Borax powder. It a laundry booster. This is the key ingredient to making silly putty. I think we should make something called a saturated solution. Now, you probably don't know what a saturated solution is, right? But let me explain something to you. If you had a cup of water and you put a teaspoon of sugar in the water, and you stirred it around, what happens to the sugar? It dissolves. If you put a second teaspoon, it dissolves. Ten teaspoons, it dissolves. By the 20th teaspoon, you see, it's dissolving, it's still water, you just can't see it. But ultimately, the water could only hold so much of the sugar. It's not going to be able to dissolve anymore. By the 21st teaspoon, I'm just making that up, I don't know the actual number, eventually you'll stir, but the sugar will no longer dissolve and it sinks to the bottom. Now we made a saturated solution. Saturated means the water can not hold anymore of the sugar.

Now we're not using sugar. We're going to make a saturated solution of Borax powder. So I'm going to put a bunch of Borax powder in here, Okay? The saturated the solution, the better your silly putty will be. And I'm going to stir this around, and you're going to notice when I stop stirring there's still going to be some powder left at the bottom of my pitcher, and that's perfect because that means that the water is no longer able to dissolve anymore of the powder. So 30 seconds later, or 60 seconds later, stop the stirring. All of the Borax powder that was not able to dissolve is going to settle to the bottom, sort of like sand in the ocean, right? Sand doesn't dissolve. Well, now the Borax can no longer dissolve because there's too much already dissolved within the liquid. That's my saturated solution.

Now, what's step 2? I'm going to take a cup, and I'm going to take a spoon, and now, I'm going to use regular water, Okay? Doesn't matter, the temperature, it just matters that it's regular water. Now, you want to use a one to one ratio. So if I use one teaspoon of water, then my second ingredient is going to be glue. So if I make one teaspoon of water, I put one teaspoon of glue. If I want to make it bigger, so one to one ratio, it's equal amounts, four teaspoons of water equals four teaspoons of glue.

I'm going to start with my water. Let's count toge

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