Final answer:
Temperature should be recorded in red ink when it indicates a high fever or a potential health concern, and in medical documentation or scientific research to highlight critical temperatures.
Step-by-step explanation:
The temperature should be recorded in red ink in specific medical documentation circumstances to indicate a high fever or to mark temperature readings that signify a potential health concern, such as infection or inflammation. For instance, in medical charts, red ink may be used to denote feverish temperatures which require immediate attention.
Additionally, thermal imaging, like in infrared thermographs, uses a color scale where red to white represents hot areas, potentially indicating inflammatory conditions or areas with increased blood flow, such as malignant tissue.
Similarly, in scientific research or critical lab experiments, temperatures that exceed certain thresholds may be recorded in red to highlight them for review and action.