This paper deals with the work carried out to define new formulations used to increase the infrared effectiveness of a reference Smoke producer composition. This pyrotechnic mixture is constituted by a combination of oxidizing agents and fuels generating mainly carbon but also chlorinated metallic salts which are essential for camouflage by combustion. First, for several compositions, the 3-5 mum and 8-12 mum extinction coefficients are correlated to the proportions of Magnesium and (Mg + MgCl), respectively (determined by thermo-chemical computations with the Bagheera code), Then, to widen the investigations on smoke producing compositions, this correlation was studied by associating two experiment designs, an equiradial matrix and a Scheffe mixing matrix. We would point out that using this experimental strategy makes both possible, the minimization of the number of experiments - and therefore the cost factor - and the modelling of the results which allows to gain the properties of potential formulations on the whole experimental field.