A method for minimizing metamerism for a set of color standards, such as for example a set of paint colors, and color merchandise, such as for example a paint chip, comprising the steps of: (a) providing a set of color standards; (b) measuring a spectral reflectance factor of each color standard within said set; (c) determining an ink composition corresponding to the spectral reflectance factor of each color standard; (d) producing a set of color merchandise with an inkjet printer using said ink compositions; (e) measuring a spectral reflectance factor of each color merchandise; (f) evaluating the degree of metamerism for the set of color standards and color merchandise by a sub-method comprising the steps of: (i) evaluating the degree of metamerism for a single color standard-color merchandise pair, under a plurality of illuminants, by means of an instrumental test having a first acceptance criterion; (ii) returning to step (c) if the single color standard-color merchandise pair has an unacceptable degree of metamerism, under the instrumental test, until an acceptable degree of metamerism is achieved or until it is determined that no optimal solution exists; (iii) repeating steps (i) to (ii) for all other color-standard merchandise pairs in said set; and (g) determining the value of p ins, wherein p ins represents the percentage of color standard-color merchandise pairs that pass the instrumental test; and (h) modifying the first acceptance criterion if p ins is below an optimal value. (a) providing a set of color standards; (b) measuring a spectral reflectance factor of each color standard within said set; (c) determining an ink composition corresponding to the spectral reflectance factor of each color standard; (d) producing a set of color merchandise with an inkjet printer using said ink compositions; (e) measuring a spectral reflectance factor of each color merchandise; (f) evaluating the degree of metamerism for the set of color standards and color merchandise by a sub-method comprising the steps of: (i) evaluating the degree of metamerism for a single color standard-color merchandise pair, under a plurality of illuminants, by means of an instrumental test having a first acceptance criterion; (ii) returning to step (c) if the single color standard-color merchandise pair has an unacceptable degree of metamerism, under the instrumental test, until an acceptable degree of metamerism is achieved or until it is determined that no optimal solution exists; (iii) repeating steps (i) to (ii) for all other color-standard merchandise pairs in said set; and (i) evaluating the degree of metamerism for a single color standard-color merchandise pair, under a plurality of illuminants, by means of an instrumental test having a first acceptance criterion; (ii) returning to step (c) if the single color standard-color merchandise pair has an unacceptable degree of metamerism, under the instrumental test, until an acceptable degree of metamerism is achieved or until it is determined that no optimal solution exists; (iii) repeating steps (i) to (ii) for all other color-standard merchandise pairs in said set; and (g) determining the value of p ins, wherein p ins represents the percentage of color standard-color merchandise pairs that pass the instrumental test; and (h) modifying the first acceptance criterion if p ins is below an optimal value.