Hold the slide up. On the outside you will be able to see the sulcus and gyrus. On the outside of the gyrus you can see lighter pink and on the inside of the gyrus you can see a denser pink. The lighter pink is equivalent to the gray matter and the darker pink is the white matter . White matter has a little more protein in it due to myelin and stains a little darker pink.
Gray matter has less protein.
Look at the slide at 4X. Go to the surface of the gyrus to orient yourself. You see the gray matter at the surface. See if you can observe the gray and white matter junction to tell the slight difference in their color. Remember that the gray matter is lighter pink. Layers 3 and 5 of the parietal lobe have very big neurons called pyramidal cells .