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History
editHenry Armstrong stated that he believed that Congo Red was first made by Peter Griess, who had discussed it with Heinrich Caro and Martius of BASF. See: "Chemical Industry and Carl Duisberg.", Henry Armstrong, Nature, 1935, 135(3425), 1021–1025. doi:10.1038/1351021a0 AdderUser (talk) 07:44, 27 October 2014 (UTC)
Contradictory
editFirst section says use is abandoned, then later it documents that it's still used in histology. 146.191.95.1 (talk) 15:30, 14 October 2022 (UTC)
Congo blue
editThe para on Congo blue doesn't seem to have much to do with Congo red— it doesn't even say whether they're related beyond the name. I think it should move into its own article. Marnanel (talk) 11:39, 12 February 2024 (UTC)