Discussion
In older times, guaiacum test was used for the preliminary identification of :
Answer: B
The guaiacum test was used for blood.
The guaiacum test, one of the oldest presumptive tests for blood (nineteenth century), uses a resin from the guaiac tree with hydrogen peroxide or old turpentine. The peroxidase-like activity of haemoglobin oxidises the resin and turns it blue. It has been replaced by more sensitive reagents such as phenolphthalein (Kastle-Meyer), benzidine substitutes and luminol.
Saliva is detected by amylase, semen by acid phosphatase, and urine by urea or creatinine. None of these is tested with guaiacum.
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