 Welcome back to Kids Fun Science. My name is Ken. Today's experiment is the secret messages with whole milk. What you need for this experiment is whole milk, sandpaper, a pencil, paper, q-tip, or paintbrush. Welcome back to Kids Fun Science. So today's experiment is a secret message. Now a couple videos back, we did a secret message with a mirror, two pieces of paper, and some water, and we were able to hide the message and reveal the message. This time we have hidden messages here, but I'm going to do a little different. I'm going to show you the experiment and then I'm going to show you how to do it. So just by rubbing your finger, the letters start to appear. And next thing you know before you realize it, you've got your secret message. But how do you do it? And that's what I'm going to show you next, is how to write your secret message. So to start this experiment off, you need whole milk, right? So the more fat content in the milk, the better this experiment is going to work. What you also need is a q-tip and the milk. So when you first start, you dip in the q-tip and then you write your message. I personally like to do each letter and then re-dip into the milk each time, as I believe you get a more clearer message at the end results when you reveal the message. So do not use skim milk because it will not work. So that's how you do set up the experiment. After you write your message out, you need to let it dry for about 30 minutes before you could actually do the experiment. So here are my two secret messages. You can still read them. You can see what I'm saying because the paper is wet and that's why you need to wait 30 minutes before we do the next step of the experiment. So this is 15 minutes afterwards. You can see the message is starting to disappear and we're getting ready to do the experiment. So our paper is dry and our secret message is hidden. So the next step is to take a pencil and rub it against the sandpaper which will release the graphite onto the secret message. And then you say, whoa, wait, I don't see the secret message. Well, there's one more step you need to do to reveal the secret message and you need to take your finger and you need to start rubbing the graphite into the paper, which is going to reveal your secret message, which is pretty cool. So here this message we're going to meet at 4pm. No one was able to decipher that, but the person you sent it to because they know how to do that, which is pretty cool. So that's how you make a secret message with only milk, q-tips and a pencil, which is pretty awesome. I hope you enjoyed this experiment. If you did, remember to click thumbs up and to subscribe. If you click the bell, you'll be able to be reminded when I post my next experiment. So once again, thanks for your support and thanks for watching. Fine, hang up.