We have looked at making ‘plastic milk‘ before. This week we’re taking it one step further to make glue from milk.
How to make glue from milk
What you need:
- Milk
- White vinegar
- Baking soda
- Pan
- Water
- Strainer
Instructions
- Heat 1 and a half cups of milk in a pan, once warm add 3 teaspoons of white vinegar.
- Keep heating and stirring the mixture and you should see the curds ( solid part ) and whey ( liquid part ) separate.
- Strain the mixture using a sieve. You should be left with solid lumps which you can mould together to make a ball. These are the curds.
- Place the solid mixture back in the pan and add a little water and a tablespoon of baking soda.
- Heat the mixture until it starts to bubble.
- Give it a good stir and let it cool. You can now use it as glue. You might need to add a little more water or baking soda until you get the right consistency. It should look like a thick paste.
- I tested ours by sticking two egg boxes together ( both contain eggs, so are heavy ). It worked!!!
The Science bit
Here’s what happened to the milk. By adding the vinegar, you create a chemical reaction which makes the milk to separate into two parts, a solid (the curds), and a liquid (the whey). The curds are milk protein, called casein. Liquid casein is a natural glue.
When we add the baking soda it neutralises the vinegar ( which is acidic ). The bubbles are caused by Carbon dioxide gas being given off as part of the reaction. The curds form a liquid again after being neutralised.
It’s very interesting. I have this idea in my mind but I haven’t realize it yet. Every sunday we do a scientific experimet and maybe one of the next sunday we will make it.
Greetings from Ital
Sorry from Italy
Ah! Interesting – not doing this one though when there are more beautiful things i still haven’t done – like the Christmas sugar crystals!
amazing! that’s very clever…although I cant begin to imagine the smell!
x
My kids would love this! Fantastic idea! Thanks!
WOW!! How cool! You come up with the neatest ideas!!! Thanks for linking up to TGIF =-)
Beth
Ya, this is cool. But not THAT sticky.
oh NEAT! So glad I found this post…I’m going to try making glue! I’d love it if you would share this with my readers for Fun Stuff Fridays. Would you please link up? http://www.toysinthedryer.com/2012/02/14-days-of-valentines-fun-stuff-fridays_10.html
Very cool I think I need to store these ideas up for when I go back to teaching
Thank you for linking up to Tuesday Tots
Sweet! This is awesome.
This is awesome. Going to do this tomorrow. Then I’ll take it a next step. My daughter wants to know if add in borax would have the same effect on this glue as store glue.
this is the best experiment ever.
im doing this experiment for my science project
wish me luck..:)
Does this experiment work with evaporated milk?
This is a graet idea!!!!!!
AWESOME!!
how much will this glue still works before it dries
Very cool! This type of glue was used in the early days of wooden aircraft construction.
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I believe this works best with skim milk.
WOW! Thanks Science Spark I can do this from my SIP(science investigatory project)
I recall reading that the very earliest Bell Helicopters – the one with the clear bubble –
used casein to mold the bubble. This was because they could mold casein, but
did not yet have the technology to make the bubble out of acrylic resin.
They had a big incentive to develop the acrylic bubble. If left out in the rain, the
casein bubble tended to turn “milky”.