Multiple choice The cytoplasm of large neurons turns dark blue due to hematoxylin staining on golgi apparatus axon hillock polyribosomes and rough endoplasmic reticulum lipofuscin euchromatin Reveal answer Fill a bubble to check yourself C Correct answer Explanation Yes, it is correct. The polyribosomes and rough endoplasmic reticulum turn dark blue with hematoxylin due to the presence of ribonucleic acids. Thus, the cytoplasm of large neurons turns dark blue due to hematoxylin staining on it.