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History edit
Henry 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 edit
First 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 edit
The 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)