At present, the "sticky cotton" reputation is the criteria taken in account by buyers. But only a scientific analysis could allow to classify the bales, then to identify and to certify the non-sticky ones. The discount applied today to sticky bales depends on the level of supply of cotton on the market and on the level of modernity of the spinning mill using them. But over fifty sticky points, a cotton cannot be processed pure and is no more bought. In the Sudanese conditions, the financial evaluation of a classification has to be based on economical data, not yet all available.