In soap, fatty acids made from boiling pork bone fat are used as a hardening agent, but also for giving it a pearl-like effect.
I bought a year's production of flax from a single field owned by a Dutch producer. That's 10,000 kilograms of flax, enough to enable industrial level production. Now, I'm weaving it into tablecloths, tea towels, and other items at the Textile Museum in Tilburg. I'm producing hundreds of grown-up products!
I discovered that bone china was a British invention, which had been developed by a pottery sited next to a slaughterhouse - 'bone' china, of course, contains bones, though we are inclined to forget that.
