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@JamesWallis endless details for the devil to hide in... but bioplastics exist, are injection mouldable, and are used in toys. fairly arbitrary link, but it gives some context greendotbioplastics.com/injection-molders-made-bioplastics-work/
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@JamesWallis (this is only partially a joke, this video shows someone making PET plastic from food starches and cucumber pickle juice. and then making a knife out of it)