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In a number of instances a new method is developed from an existing one.  In these situations it is sometimes difficult to appreciate why a method is better/different especially when it is a smaller change.  This category of metadata was developed in order to capture more detail about a method(s) from the perspective of the chemistry or processing of samples, i.e. the use of different material, glassware or small components of an analytical system.  For instance, the addition of a new chemical to a reagent may add stability that improves the reliability of a method, or the use of a different analytical column affords a faster or lower interference detection. If you have a better name for this category than materials send your suggestion to This email address is being protected from spambots. You need JavaScript enabled to view it..