Differences between Assay, Purity and Potency. Assay is the quantitative determination of the amount of a component in a sample. An assay may not be highly specific for a particular ingredient. Assay can be determined either by titrimetric methods or HPLC methods or GC methods and so on. Assay can be calculated by following methods.

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The Institute for Analytical Philately, Inc. Volume 5, Issue 2, October 2014. 2nd International Symposium on Analytical Methods in Philately. A Colorimetric Analysis Methodology for Philatelic Studies. Applying for a Research Grant. Dwayne Littauer, Corporate Counsel. Environmental Effects on Philatelic Materials. , FRSC, Senior Fellow.