After having made a representative sample of all or part of a lot and only on this condition, we can carry out a certain number of analyzes. Those carried out in the field are called primary analyzes. For them to be official, they should be carried out under laboratory conditions and according to specific standards, which is rarely the case. For example, I quote the hagberg test, which requires, among other things, a waiting period between grinding and the actual test of one hour of waiting and the coupling of two tests to ensure repeatability and reliability. of the test. This is almost never respected in the field.
However, these controls allow to give fairly precise information on the qualities of the lots which gives the possibility to intervene on the loadings to help that the goods exchanged comply with the contractual conditions.