I think my initial post was misunderstood. Perhaps the following will clarify matters. I never said that a negative from a staining developer couldn't be fine grained but rather that it could never be as fine grained as a normally developed negative. The reason for this is that a staining developer adds to each grain a dye cloud. The dye cloud is formed of oxidation products of the developing agent which are strongly colored. Since it cannot occupy the same space as the silver grain from which is was created it must form around the silver grain. Therefore, the effect is to enlarge the grains. In fact, if you look at published photomicrographs of such negatives you will see that each grain is surrounded by a dye cloud which is several times larger than the silver grain. The same thing happens with color emulsions but in this case the silver is eventually removed. There is nothing mystical about what happens. A print from a stain negative can have all the aspects we desire. But at very large magnifications it will never be as sharp as a print from a conventional fine grain negative.