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Homemade Plastic

Step 2Heat it up

Heat it up
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If you've never heated milk before, it's important to know that if you heat it too fast, it will start to burn on the bottom of the pot. To bring it to a simmer, it's best to keep the heat down to about 50-60%.

I don't follow my own advice, and use full heat, because I don't want to wait.

While the milk is heating, be sure to stir it occasionally, so it doesn't burn. Also, if you're heating more than one or two cups of milk, measure the vinegar out into the cup while the milk is warming. This is personal preference, as it makes it easier to pour the vinegar in all at once, rather than measuring it out in a hurry.

During this time, you may need to pander to a needy cat, if one happens to be around.

When the milk nears boiling, you will notice a foam forming on top of the milk, as well as a little noise coming from the pot. Steam will start to appear too.

Once you reach this point, turn off the heat, pour in the vinegar, and stir. You will immediately notice chunks of casein forming. Stir it for another thirty seconds or so, for good measure.

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7 comments
Aug 3, 2011. 7:18 PMsudanione says:
can this act as greenhouse cover..................................if the answer is no how can i construct green cover at home
Aug 20, 2011. 12:44 PMkhampton2 says:
http://www.buffalo-niagaragardening.com/2011/03/22/5-great-tips-for-starting-new-plants-from-cuttings/
Sep 4, 2010. 4:51 PMjoezy0 says:
Does this plastic go mouldy?
Oct 12, 2009. 10:35 AMgodspiral says:
I tired to make this with left over cappucino foam, but it didn't work at all.

First of all, when you heat milk, it will rise (very rapidly too) at one point.  Is that what you call boiling?

I used 1% (organic) milk.  I pored some into hdpe container after it rose.  I may have used a foaming whip while it was heating. and did use foaming whip after I pored into container.  Straining it had very little and very thin clumps of goop.  Metal strainer instead of coffee filter prob didn't help much.  No amount of reheating and adding more vinegar helped in getting a useful amount of goop.

As I write this, I realize that foaming whip probably broke down the cassein into smaller than metal strainer holes.
Oct 14, 2009. 12:51 PMgodspiral says:
it was just a clean hdpe yougurt container, that I transfered the milkto and from via the strainer.

I still don't understand what simmering milk is.  

When you Heat milk, it will eventually rise up and thicken, and quicklyoverflow the pot.  Simmering must mean the very light bubbling thatoccurs just before this stage?
Apr 15, 2010. 4:54 AMmacrumpton says:
FYI If the yogurt container was white plastic it is almost certainly polypropylene (PP) and not high density polyethelene (HDPE).
Jun 30, 2008. 4:58 PMchamunks says:
If one were to want to add a color to this casein would before adding the vinegar be a good time to add some sort of food coloring?
Jul 6, 2008. 5:43 PMadlabens says:
May want to try Easter egg dye because the recipe for that calls for some vinegar (I presume that helps the dye penetrate the calcium egg shell).
Aug 7, 2008. 1:13 PMwhiteoakart says:
in general, vinegar helps 'set' the dye and makes it more water-resistant. However, as vinegar is an acid and egg shells are a base, your idea is certainly plausible.
Jun 15, 2008. 5:48 PMbigfootduck says:
the second picture is my favorite. It reminds me of my cat. except she is so spoiled that no matter how many times i pet her, she doesn't go away. UGH!

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Author:Coffeebot(Coffeebot)
Just a dude who likes making things :)