Carrageenan is commonly used as a gelling agent in jelly desserts.
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卡拉 is the phonetic loan for 'carra-' and 胶 means 'glue/gel' - literally 'carra-gel,' matching the English 'carrageenan.' The same 胶 appears in 明胶 gelatin, 果胶 pectin, 琼胶 agar.