Knowledge Base › Troubleshooting Atlas › H&E staining
Background basophilia (blue haze)
What it looks like
The slide exhibits a diffuse blue haze that obscures cellular details, making it difficult to interpret the staining results.
Where it usually appears: Commonly observed in sections with high RNA content or in poorly processed tissues.
Likely causes
- Excessive fixation time leading to over-fixation
- Inadequate dehydration during processing
- Improper pH of the staining solution
- Contamination with basic substances
Immediate checks
- Inspect the pH of the staining solutions
- Check fixation time and method
- Review processing steps for dehydration adequacy
Corrective action
- Adjust the pH of the staining solution
- Optimize dehydration steps in tissue processing
- Reduce fixation time if excessive
Preventive action
- Regularly calibrate and maintain pH meters
- Implement standard processing protocols
- Train staff on proper fixation and processing techniques
This atlas is for educational purposes for laboratory professionals. It does not replace your institutional SOPs, manufacturer instructions, validated protocols or pathologist judgment. Adapt any action to your laboratory and equipment.
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