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The color code that signifies instability in hazardous materials is yellow. In the context of signaling hazards associated with materials, yellow is widely recognized for indicating caution or warning. Specifically, it often relates to the potential for instability or reactivity of particular substances. This is critical for safety protocols in handling and storing hazardous materials, as it alerts personnel to the need for special precautions.

Red typically represents flammability or fire hazards, while blue is often associated with specific health risks. White generally does not have a universal meaning in terms of hazard classification. Understanding these color codes is essential for ensuring proper safety measures are followed in environments where hazardous materials are present.