the finest particles or flour sift to the bottom within grain purifying step 120 the ground bran 102 is lifted and separated from germ 104 and endosperm 106 by a controlled air stream the remaining germ 104 and endosperm 106 can then be passed through a series of break rolls wherein germ 104 is flattened for easier separation and the endosperm 106 is ground into flour within bleaching step 122 the flour consisting essentially of ground endosperm 106 is exposed to a bleaching maturing agent such as for example chlorine gas or benzoyl peroxide to both whiten the flour and mature or oxidize the flour to improve the baking characteristics of the flour within enrichment step 124 a measured quantity of enrichment components such as for example thiamin niacin riboflavin iron folic acid leavening agent salt and calcium are added to the whitened matured flour in a whole grain milling operation 126 as schematically illustrated in fig3 grain kernel 100 can be milled to form whole grain flour 128 whole grain milling operation 126 similarly comprises grain cleaning step 112 grain conditioning step 114 grain grinding step 116 grain sifting step 118 and grain purifying step 120 following grain purifying step 120 a reconstituting step 130 blends back the separated portions of the grain kernel 100 for example the milled bran germ and endosperm to form whole grain flour 128 through the use of reconstituting step 130 whole grain flour 128 can be stabilized in addition whole grain milling operation 126 can comprise one or more heat treating steps so as to further stabilize the bran and or germ when milled with whole grain milling operation 126 whole grain flour 128 includes visual particulate matter that.