Congo Red Test Paper The Congo Red test paper is used to test narrow-range acidic solutions. 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 bright brilliant red above pH 5.2.

Recently Viewed

View All
  • Recently Viewed Products is a function which helps you keep track of your recent viewing history.
    Shop Now