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An ancient recipe for gypsum stone. We analyze one of the recipes from the "Handicraft Handbook". Simple technology, available components, proven result. Preparation of bone glue: https://boosty.to/strangestones/posts... Hydrophobization of gypsum: https://boosty.to/strangestones/posts... All videos from this channel, plus some of our work: https://vk.com/stranges.stones Group for discussing man-made stone techniques: https://t.me/strangestones Even more videos. Ancient recipes, modern techniques, experiments: https://boosty.to/strangestones/about https://t.me/Strange_stones_bot Support our experiments: https://boosty.to/strangestones/donate