Congo Red indicator paper provides a qualitative pH indication from 3.0 to 5.0, turning blue below pH 3.0 and bright red above pH 5.0. Commonly used for monitoring acid washes in metal plating.
Graduation : pH < 3 Blue/Violet - pH > 5 Orange/Red
| pH < 3 Blue/Violet - pH > 5 Orange/Red |
Congo Red indicator paper provides a qualitative pH indication from 3.0 to 5.0, turning blue below pH 3.0 and bright red above pH 5.0. Commonly used for monitoring acid washes in metal plating.
Graduation : pH < 3 Blue/Violet - pH > 5 Orange/Red