The image shows a flame fueled by a homemade gel. The gel is produced through a reaction between calcium carbonate and acetic acid, which yields calcium acetate. Mixing this compound with isopropyl alcohol causes it to solidify into a burnable gel material. This substance is commonly used as a portable heat source.
https://www.flowvis.org/wp-content/uploads/2025/10/Team_First_Report.pdf
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Looks like a mushroom cloud! Going with this image is great and shows a lot of context as well