Ready-to-Use Giemsa Staining Solution

Guide (The following is our recommended protocol. This protocol is only a guide and should be modified according to your specific needs).
1. Smear Staining
1.1 Smear Preparation and Fixation
Prepare a blood smear or other type of smear, allow it to air-dry naturally, and then fix the smear in methanol for 2–3 minutes.
1.2 Giemsa Staining
Place the fixed smear on a staining rack, add an appropriate amount of Ready-to-Use Giemsa Staining Solution to completely cover the sample on the slide, and stain at room temperature for 10–15 minutes. After staining, gently rinse by slowly adding tap water or distilled water from one end of the slide.
1.3 Drying and Observation
Allow the smear to dry completely, then observe under a microscope.
1.4 Staining Results
Eosinophilic granules: Pink
Basophilic granules: Purple-blue
Neutrophilic granules: Pale purple

2. Tissue Section Staining
2.1 Section Pre-treatment
Dehydrate and embed the tissue using standard methods, and prepare sections approximately 5 μm thick. Treat the sections with xylene or Leagene dewaxing and clearing solution to complete dewaxing and rehydration.
2.2 Giemsa Staining
Rinse the sections twice in distilled water for 1–2 minutes each time. Subsequently, immerse the sections in Giemsa stain and stain for 12–24 hours. After staining, briefly rinse with distilled water.
2.3 Acetic Acid Differentiation
Treat the sections in 0.5% acetic acid for 1–2 minutes, then gently rinse with tap water.
2.4 Dehydration
Rapidly dehydrate using absolute ethanol; perform three treatments, 5–10 seconds each.
2.5 Clearing and Mounting
After clearing with xylene or Leagene dewaxing/clearing solution, mount the sections using neutral resin.
2.6 Staining Results
Nuclei: Blue to purple
Cytoplasm: Pale blue
Connective tissue: Pale red

3. Precautions
3.1 When preparing blood smears or other types of smears, ensure uniform thickness to avoid inconsistent staining and to prevent compromising observation results.
3.2 After Giemsa staining, do not immediately discard the staining solution or subject the slides to a forceful direct rinse, as this may adversely affect the staining quality.
3.3 If the final staining intensity is too dark or too light, adjust the staining time (lengthen or shorten) or the concentration of the staining solution accordingly.
3.4 The pH of the staining system affects the staining results for both smears and tissue sections. Therefore, ensure slides are clean and free from contamination by acids, alkalis, or other substances.
3.5 After diluting the staining solution, observe the surface for a metallic sheen. A distinct metallic sheen usually indicates that the solution has normal staining capability; the absence of such a sheen suggests the solution may have lost its efficacy.

MedChemExpress (MCE) has not independently confirmed the accuracy of these methods. They are for reference only.