Assessment of the relationship between drying shrinkage and residual moisture of ceramic bodies and clays during the drying process. The test is carried out by monitoring the drying process of test specimens or industrial parts, through periodic assessments of drying shrinkage and humidity. The Bigot curve is useful for evaluating the sensitivity of masses and clays during the drying process. Likewise, it provides useful information for designing drying curves, establishing the critical moisture content in the samples, responsible for conditioning the drying speed of ceramic products.