. "0"^^ . . . . "110590348"@en-us . . . "113928093"@en-us . "congo red"^^ . . . "0"^^ . "114770631"^^ . "14770631-n"^^ . . . "a red-brown azo dye especially as a chemical pH indicator (congo red is red in basic and blue in acidic solutions)"@en-us . "congo red"@en-us .