Abstract: A method that is suitable for modelling and simulating optical properties in special effect paints which contain pigments with isotropic light-scattering properties and pigments with anisotropic light-scattering properties, and the effect-producing substances form at least one layer of material or coat of paint on a suitable substrate. The method is characterised in that the isotropically light-scattering pigments and the anisotropically light-scattering pigments are virtually separated such that the isotropically light-scattering pigments virtually form the layer of material and the anisotropically light-scattering pigments are virtually arranged on the edge surfaces of the layer of material. The optical properties of the virtual layer of material of the isotropically light-scattering pigments are determined by linear differential equations and the optical properties of the anisotropically light-scattering pigments are taken into consideration as boundary conditions, by means of specific effect operators.

Abstract: A method that is suitable for modelling and simulating optical properties in special effect paints which contain pigments with isotropic light-scattering properties and pigments with anisotropic light-scattering properties, and the effect-producing substances form at least one layer of material or coat of paint on a suitable substrate. The method is also suitable for reproducing a shade of colour of a colour template of a special effect paint of this kind, by determining and comparing the optical properties of the colour template and a formulation of a paint mock-up, so that using the comparison a correction can be made to the formulation for the paint mock-up and the shades of colour of the colour template and paint mock-up can be matched.