color standard are illustrated on the scale of fig3 wherein 34 value 34 is represented in the center axis by grey scale the 34 chroma 34 is represented from the center ring to the outside circular cross section and progression around the circle represents 34 hue 34 the 34 value 34 is variable in accordance with the invention by increasing or decreasing the amount of the initial pigment in the standard material or by addition of an achromatic black or white pigment dopant before mentioned the 34 chroma 34 may be varied by increasing or decreasing the concentration of the original pigment which as above stated also affects the 34 value 34 the 34 hue 34 may be changed by changing pigments or by mixing the same by changing the initial packing density of the pigment polymer mixture both chroma and value may be changed in addition gloss may be introduced by proper post sintering surface preparation as later explained the blended material at 48 is then weighed and compressed at 86 to give a standard of known density the color of the final product being directly related to the pre sintering compression density once compressed to a suitable size the material is sintered at 60 upon a porcelain plate 58 at 360 u00b0 370 u00b0 c for a predetermined number of hours where the sintering time is dependent upon the size of the piece once sintered the material is cooled slowly to avoid warping or cracking after cooling the material may be finished.