Congo Red
Of solution, acid-base indicator and azo dye.
A red-brown azo dye especially as a chemical pH indicator (congo red is red in basic and blue in acidic solutions).
This concept's ID is @1~74622
Of solution, acid-base indicator and azo dye.
A red-brown azo dye especially as a chemical pH indicator (congo red is red in basic and blue in acidic solutions).
This concept's ID is @1~74622