Cork stoppers are considered unsafe for bottling, since they can cause organoleptic problems that can alter wine. The solution is possible with a relatively simple system: by testing the cork to understand exactly which steps to take. There are organoleptic tests to be done on corks that consider and test all organoleptic parameters related to the material: contaminated such as TCA, TCB, and pyrazines, leakages related to the cap density, moisture, residual of oxidants, etcetera. The purpose of these “sample” analysis (the percentage of stoppers to be analyzed is defined by a precise sampling plan) is to obtain a result within the range defined by the current regulations, by stating if the cork meets the regulations. Those who buy cork, therefore, must require these tests to their suppliers, and carry internal controls with the same methodology and standards used by their suppliers. According to Labrenta this is the only system that guarantees a secure cork clamp. This system is called Check Cork 5, shown in the picture.