Before the invention of hard plastics, people used milk — Here’s how…

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With just a little bit of vinegar and a strainer, milk can be turned into a completely moldable putty that will set hard as rock. Before today’s variety of plastics came along, this milk-based product was used in the production of buttons, pens, knitting needles, and much more.

Here’s how you can make it yourself…

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(via Doobybrain)