Knowledge Base › Troubleshooting Atlas › Reagents & safety
Reagent evaporation changes concentration
What it looks like
Reagents may appear more concentrated or darker than expected on the slide or block due to evaporation. This can lead to inconsistent staining and interpretation issues.
Where it usually appears: This issue is commonly observed during prolonged open storage of reagents or in warm environments.
Likely causes
- Prolonged exposure to air
- Inadequate sealing of reagent containers
- High ambient temperature
- Frequent opening of reagent containers
Immediate checks
- Check the volume of the reagent in the container
- Inspect for signs of evaporation or residue
- Verify storage conditions
Corrective action
- Dilute the reagent to the correct concentration
- Replace the evaporated reagent with a fresh batch
- Ensure proper sealing of containers
Preventive action
- Store reagents in airtight containers
- Use desiccants in storage areas
- Maintain stable temperature conditions
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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