Perfect Blood Smear & Staining Guide Approximately 10 µl of whole blood, after the blood smear is prepared, place it in a well-ventilated area to dry for later use. Pay attention to the following points when staining: 1. The blood smear must be completely dry before starting the staining process. 2. The slide should be placed horizontally, evenly sprinkle 0.5 ml of Solution A and 1 ml of Solution B over the entire slide, use a rubber bulb to ensure thorough mixing and stain for 4 minutes (6–7 mi