How to prepare a slide

• 1. Add a drop of water to the middle of a clean slide.
• 2. Cut up an onion and separate it out into layers. Use tweezers to peel off some epidermal tissue. From the bottom of one of the layers.
• 3. Using the tweezers, place the epidermal tissue into the water on the slide.
• 4. Add a drop of iodine solution. Iodine solution is a stain. Stains are used to highlight objects in a cell by adding colour to them.
• 5. Place a cover slip (a square of thin, transparent plastic or glass) on top. To do this, stand the cover slip upright on the slide, next to the water droplet. Then, carefully tilt and lower it so it covers the specimen. Avoid getting air bubbles on the slip - they'll obstruct the view of the specimen.