1.1.1—Temporary cell preparations

A temporary preparation lets fresh cellular material be viewed with a light microscope without making a permanent slide.

1. Put a liquid sample on a clean slide, or cut a solid specimen thin enough for light to pass through.
2. Add a suitable stain when contrast is needed.
3. Lower the coverslip from one edge to reduce trapped air bubbles.
4. Remove excess liquid and view the preparation promptly so it stays in place and does not dry out.

The coverslip protects the objective lens and limits drying. Iodine can increase contrast in plant tissue, while methylene blue can make cheek-cell structures easier to distinguish.

A stain improves contrast but does not create detail that the microscope cannot resolve. The preparation must remain thin and representative of the material being investigated.