Knowledge Base › Troubleshooting Atlas › H&E staining
Uneven differentiation across the slide
What it looks like
The slide shows areas with varying intensity of staining, resulting in some regions appearing overly dark while others are pale.
Where it usually appears: Typically observed during routine H&E staining of tissue sections.
Likely causes
- Inconsistent timing in staining steps
- Uneven application of reagents
- Variations in tissue thickness
- Inadequate washing between steps
- Contaminated reagents
Immediate checks
- Verify timing of each staining step
- Inspect for even application of reagents
- Check for consistent tissue section thickness
Corrective action
- Re-stain the slide with consistent timing
- Ensure thorough washing between staining steps
- Re-evaluate reagent quality
Preventive action
- Standardize staining protocols
- Train staff on consistent application techniques
- Regularly calibrate equipment for consistency
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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