Final answer:
A modified Wright or Wright-Giemsa stain can stain mast cell granules and granules in lymphocytes purple, aiding in the detection of cutaneous mast cell tumors. It is commonly used in the staining of blood smears to evaluate blood cell appearance and identify different types of white blood cells.
Step-by-step explanation:
A modified Wright or Wright-Giemsa stain has the advantage of staining mast cell granules and granules in some lymphocytes purple, which can be helpful in the detection of cutaneous mast cell tumors. However, it is not true that the stain itself is not permanent, as it does leave a lasting stain on the cells. Additionally, the stain is not necessarily of lower quality than other quick stains, nor is it very expensive. Wright-Giemsa stain is commonly used in the staining of blood smears, allowing for evaluation of blood cell appearance and identification of different types of white blood cells.