Instructables

Milk + Soap = Awesome Reaction

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Picture of Milk + Soap = Awesome Reaction

Great fun for kids and adults! Minimal set up and clean up makes this at home science / art project a real winner.

When you're done reading this instructable feel free to check out more of my how-to, life hack and DIY videos and articles by visiting my YouTube channel or website.

YouTube channel: www.youtube.com/TheBestHobbiesBlog

My website: www.thebesthobbiesblog.com

 
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Step 1: Watch This Video!

Here you can see this awesome reaction happen right before your eyes!

Step 2: What You'll Need

The first thing you'll need is some milk. I've found that whole milk works best, but you can use any kind.

Food coloring will allow you to see what is actually happening and create beautiful swirls and patterns. Any kind, color or amount will work. Have fun experimenting!

To hold the milk, use a shallow bowl or a plate with raised edges.

Regular old dish soap is the way to go.

Finally some Q-tips to apply the soap with.

Step 3: Add the Milk

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You won't need much at all. Just a thin layer of milk will do. Because so little milk is needed I poured mine into a plate with raised edges instead of a much deeper bowl.

Step 4: Prepare some soap

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Pour some dish soap into a mug, glass or cup. As with the milk, you won't be needing much.

Step 5: Add Some Color

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Now you can get down to the fun stuff! I started by adding four or five drops of purple, red, green and blue in the center of the plate. But as I stated in a previous step: you can use any colors you'd like. Have fun placing different numbers of drops in different areas of the plate to see what will happen.

vivi128 days ago
this was really fun 4 me and instead I used gel food coloring but it still worked because I didn't have liquid food coloring so next time I need a science experiment then this is what I'm gonna do instead???????

I think if you used liquid watercolour paint or dyes you could use this for interesting effects on marbled paper.

cat19861 month ago
That is Beautiful this would be A Good Science Project
Remag12341 month ago

Nice Video. And now for my comment to the Nit Pickers.

To the Nit Pickers: Why is a scientific explanation needed? Why not just enjoy the video, try it if you like it. Do your own research for the Science of it.

Because the title of the video is "Milk, Soap, Science", not "Milk, Soap, Pretty Colors".

What difference does it make, NO DIFFERENCE. Some people just cannot help being Nit Pickers. What happened to your post????????

awallace9161 month ago

The soap is changing the solution of the milk. The milk is mostly water but also contains proteins and fats. The characteristics of the soap cause the solution of milk (water, fats, and proteins) to break down. What you're seeing are the molecules of soap joining up with the molecules of fat in the milk. The food coloring just allows you to see the invisible molecules moving!

Another demonstration similar to this uses water, a cereal bowl, soap, and paperclips. The challenging part is to try to float a paperclip on the surface of the water. (It's pretty tricky...the secret is to move slowly and to use a second paper clip to lower it into the water parallel to the surface) Once you have it floating, take some soap and put a little on the end of a q-tip. Gently (and I mean GENTLY) touch the the edge of the water with the soapy q-tip and you should see the paperclip sink immediately (you could also just add a drop of soap straight to the water if you're careful). Once again the soap is causing changes to the water. Here it reduces surface tension of the water. Water has cohesive properties (meaning the molecules kind of stick together) but the soap reduces water's cohesiveness (it breaks down the hydrogen bonds in water molecules).

Thanks for the explanation.

The Best Hobbies Blog (author) 1 month ago

An explanation for the science has been added. Enjoy!

cdevildevil1 month ago

I know that we could simply google the science behind this, but would you mind adding some explanation to your instructable? It would really make it complete.

(removed by author or community request)

I'll second that. Don't get me wrong, it's a great instructable and video but I'd prefer to know/learn why this reaction takes place instead of watching the pretty colours.

+1

mrcatsquid1 month ago

the dish soap spreads on the surface on milk (milk is thick enough to hold it) and pushes the food coloring aout of the way.

buck22171 month ago

I guess if you gently laid a piece of paper on the surface and lifted off you could get a "print" of them

Might look cool but would probably smell a bit when the milk went off

Verticees1 month ago

I remember doing something like this in third grade! Anyways, nice instructable, and that main picture is excellent!

I teach at an elementary school, and we used this as the basis for exploration at our math/science night. The kids loved it and I was surprised by it as well. Might also be good for exploring color mixing. Very fun!

Glad to hear you guys do this. I really would have enjoyed this in elementary school!

johnstat0001 month ago

Such a classic experiment that you have given new life! In all of my experiments with this combination, I found that Dawn dish soap works the best. Nice Job!

Thanks for the tip! I'll try it with dawn next time to see if I can get even better results.

This is really cool!

Thank you! I had a lot of fun doing this one=]