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Culture War Roundup for the week of January 8, 2024

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I remember reading a blog post many years ago that concluded it was probably a mixture of glue with cornstarch and baking soda (multiple sets of ingredients can do the same thing) that expands into a carbon foam when heated. It pointed out that there are now commercially-available coatings that use the same principle but are more durable/practical for long-lasting coatings, they're called "intumescent coatings", though their performance is held back because they're applied in a thinner layer.

I don't have a link to the blog post but looking at Wikipedia it links a youtuber who also seems to have replicated it. He also has some followup videos using different ingredients to make it and trying it for different things. If you want to see the commercially-available intumescent coatings for comparison this video shows them in action at 7:44. Though from what he says apparently they activate at a higher temperature, at least for the ones he tested. Intumescent coatings: A review on recent progress might be of interest.

Edit: Watching the youtuber's second video he discusses commercial intumescent coatings. Also this video from a manufacturer has some good footage in them in action.