Knowledge Base › Troubleshooting Atlas › Floatation & mounting
Water spots or drying marks on the slide
Also known as: slide artifacts, drying artifacts
What it looks like
Visible water spots or marks that disrupt the clarity of the specimen. They may appear as irregular shapes or halos on the slide.
Where it usually appears: Typically observed after drying or during slide preparation.
Likely causes
- Inadequate drying time after staining
- Contaminated water or mounting medium
- Humidity in the environment
- Improper handling of slides
Immediate checks
- Inspect the water source for contaminants
- Check humidity levels in the lab
- Ensure proper drying time before mounting
Corrective action
- Re-stain the slide if necessary
- Use a clean, dry mounting medium
- Wipe the slide gently with a lint-free cloth
Preventive action
- Allow sufficient drying time before mounting
- Use distilled or deionized water for rinsing
- Maintain a controlled environment with stable humidity
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.
Unimeditrek supports histopathology laboratories with tissue processors, microtomes, staining and workflow equipment plus service and AMC. Talk to a specialist →