Which presumptive test is noted for its high sensitivity?

The presumptive test noted for its high sensitivity is TMB (Tetramethylbenzidine). TMB is widely used in the detection of blood, as it reacts with hemoglobin present in blood to produce a distinct color change. This colorimetric reaction allows even minute quantities of blood to be detected, making TMB particularly effective for forensic purposes where trace evidence is crucial. The high sensitivity of TMB means that it can identify blood even when it is greatly diluted or present in very small amounts, which is essential in crime scene investigations where evidence may not be readily visible.

Phenolphthalein, while a well-known presumptive test for blood, is less sensitive compared to TMB and may require a larger sample to produce accurate results. Hexagon OBTI is also effective but is designed with specific applications in mind, which may not be as universally sensitive as TMB for detecting blood. Color tests encompass a range of methods and their sensitivities can vary, but they generally do not match the high sensitivity of TMB. Thus, TMB stands out in this context due to its ability to reliably identify low concentrations of blood, making it a preferred choice in forensic testing.