Sodium rhodizinate turns to which color?

Sodium rhodizinate turns to which color?

• A. Blue
• B. White
• C. Orange
• D. Pink, red, yellow

Answer: (D)

Sodium rhodizinate is a colorimetric indicator used in lead-detection tests. When lead is present, it reacts to produce a colored complex, and the observed hue isn’t fixed—it can appear as pink, red, or yellow depending on the lead concentration and the specific kit formulation. This variability is why the correct description of the color change includes pink, red, or yellow. A positive result is indicated by one of these pink-to-red-to-yellow colors, whereas other colors (like blue) would not align with a typical lead-detection response.

Sodium rhodizinate is a colorimetric indicator used in lead-detection tests. When lead is present, it reacts to produce a colored complex, and the observed hue isn’t fixed—it can appear as pink, red, or yellow depending on the lead concentration and the specific kit formulation. This variability is why the correct description of the color change includes pink, red, or yellow. A positive result is indicated by one of these pink-to-red-to-yellow colors, whereas other colors (like blue) would not align with a typical lead-detection response.