KnowraIndigo carmineLinked fromLinked fromThe 3 pages that link to Indigo carmine, each with the reason it gives.All 3Broader topic 1Compared with 2Indigo dyeCompared with: Unlike indigo, its sulfonate groups make it water-soluble without vat reduction.Methylene blueCompared with: Unlike methylene blue, indigo carmine is an alternative redox dye with distinct chemistry and clinical uses.