Which characteristic is NOT typically considered when evaluating a refrigerant?

When evaluating a refrigerant, characteristics such as boiling point, toxicity, and global warming potential are critical as they directly impact safety, efficiency, and environmental considerations during its use. The boiling point helps determine how well a refrigerant can perform in a given system, while toxicity assesses safety for both workers and the environment. Global warming potential provides insight into the refrigerant’s contribution to climate change over time.

Color, however, is not a characteristic typically considered when evaluating a refrigerant's effectiveness or safety. Although a refrigerant may have a specific color, it does not affect its thermodynamic properties, environmental impact, or health risks. Therefore, color does not play a role in the evaluation process, making it the correct answer for this question.