Pack: 10 books of 20 strips – 200 Strips
Range: pH 4.4 – 2.6
Colour Change: Red- Blue
Congo Red Paper – 10 Books per Pack
The Congo Red test paper is used to test narrow-range acidic solutions.
Congo Red Test Paper is used in acid washes for metal plating where pH values are very low (pH 1.0-3.0).
The Congo Red indicator remains blue below pH 3.0, then gradually turns to a brilliant red above pH 4.4.