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Explanation: This is a comparative test in pharmaceutics that measures the characteristics of one substance against a standard of that substance (the blank). Its also possible there are other fields of application, or your terminology comes from another specialization.
Parrot Spain Local time: 06:21 Native speaker of: English PRO pts in pair: 7645
Explanation: The context is chemical or pharmaceutical analysis, especially when a enzyme-linked immunoassay or radioimmunoassay is to be performed.
Often, before the product to be analyzed is placed in the assay equipment, the test is run with water, methanol, alcohol, or another solvent (the "blank"), to check the proper functioning of the equipment and the proper analytical settings.
Hope this helps,
Heathcliff United States Local time: 21:21 Native speaker of: English PRO pts in pair: 843