Abstract: A method for monitoring properties of a mixture M of n components is provided. The mixture has properties x(B, u), where u is a recipe vector, B is a matrix of the properties of the n components, and x(u) is a vector of the k properties of the mixture M. The mixture also has at least one emission property representative of a product emitted by the mixture during the use thereof. The method includes monitoring the recipe u such that the resulting mixture M complies with specifications for each emission property. The monitoring includes estimating an emission property of mixture M of properties determined beforehand.