One possible cause of the problem in the image is

• A. Incomplete Removal Of Paraffin
• B. Excess Staining Time
• C. Inadequate Dehydration
• D. Inaccurate pH

Answer: (A)

When tissue sections still contain the embedding medium, the stain cannot penetrate properly. Incomplete removal of paraffin leaves a hydrophobic barrier on the slide that blocks water-based staining solutions from entering the tissue, so staining is uneven or very faint, and sometimes you can see glossy, waxy areas where paraffin remains. This pattern of poor or patchy staining is a classic sign that deparaffinization did not go to completion, which is why this option best explains the problem seen in the image.

If staining time were too long, you’d expect overstaining or high background rather than waxy, uncolored patches. Inadequate dehydration would leave water in the tissue, often causing poor staining and tissue distortion due to improper processing, but not the characteristic persistent waxy areas. Inaccurate pH would shift color intensity or hue rather than produce wax-like barriers.