What Everyday Things Look Like Under a Microscope

Most of the interesting things you can look at with a microscope are already in your home. Salt turns into neat little cubes. A printed photo breaks up into coloured dots. A phone screen turns out to be rows of tiny red, green and blue lights. The trick is knowing what each object needs: how much magnification, which kind of lighting, and whether to mount it dry or in water.

This guide covers common everyday specimens, what you can realistically expect to see, and a few things that can’t be seen with an ordinary light microscope at all.

What to expect before you start

There are two main kinds of microscope you are likely to use at home:

• Stereo (dissecting) microscopes usually magnify about 10x to 40x and light the specimen from above. They give a three-dimensional view of solid objects such as insects, coins, fabric and leaves.
• Compound microscopes usually magnify about 40x to 400x, or up to 1000x with an oil-immersion objective. They shine light up through the specimen, so it has to be thin enough, or transparent enough, for light to pass through.

That second point explains most beginner disappointment. If you put a thick, opaque object such as a pebble or a coin under a compound microscope lit from below, you’ll see a dark silhouette. Thin it out, flatten it, spread it in water, or switch to light from above.

As a rule, start at the lowest magnification, find the object, centre it, and only then move up. More magnification shows a smaller area and less depth, and the view gets dimmer.

Kitchen items: salt, sugar, spices, starch and onion

The kitchen is the easiest place to start.

• Table salt shows up as small, mostly cube-shaped crystals, sometimes with stepped or hollow faces. Coarse kosher salt often forms hopper-shaped crystals that look like little stepped pyramids. Use 40x to 100x, mounted dry.
• Sugar crystals are clear, angular blocks with sharper, less regular shapes than salt. Powdered sugar is just broken fragments.
• Spices such as ground pepper, cinnamon and paprika show plant cell fragments, fibres and pigment. A pinch spread in a drop of water usually looks better than a dry mount.
• Potato starch is a classic. Scrape a cut potato, put a smear in water, and at 400x you’ll see oval starch grains with faint growth rings. A drop of iodine turns them blue-black.
• Onion skin, the thin inner layer of a bulb scale, shows a brick-wall pattern of plant cells. Stained with iodine, it’s one of the best first slides you can make. Our step-by-step onion cell slide guide covers it in detail.

Paper, print and fabric

• Plain paper is a tangled mat of plant fibres. Tear a piece and look at the torn edge, where loose fibres stick out.
• Printed images in magazines and on packaging break into a pattern of cyan, magenta, yellow and black dots (CMYK halftone). Different shades come from different dot sizes and overlaps. Light from above works best, and a stereo microscope or a low-power objective is enough.
• Banknotes often carry microprinting and fine security features that you can only read under magnification.
• Fabrics show the weave or knit and the individual fibres. Natural fibres such as cotton (flat, twisted ribbons) and wool (scaly) look different from smooth synthetic filaments.
• Velcro shows stiff hooks on one side and soft loops on the other.

Screens under a microscope

Laying a phone, tablet or monitor under a microscope is one of the most satisfying quick experiments. Each pixel turns out to be several separate subpixels, usually red, green and blue. The colours you see are made by changing how brightly each subpixel glows.

To try it:

1. Display a plain white image and turn the brightness up.
2. Use light from above (or none at all, since the screen gives off its own light) and low magnification, roughly 40x to 100x.
3. Keep the objective lens off the glass. Lower the lens carefully, or use a stereo microscope, so you don’t scratch either surface.
4. Switch the screen to solid red, green or blue and watch which subpixels stay lit. Yellow lights the red and green subpixels together.

Layouts vary. Many LCD monitors use simple vertical stripes of red, green and blue. Many phone OLED screens use other arrangements, in which green subpixels may outnumber red and blue. The exact shapes and sizes differ by manufacturer, so two phones can look quite different up close.

How many pixels are in a screen?

That depends on the resolution. A 1920 × 1080 (“Full HD”) screen has about 2.07 million pixels, and a 3840 × 2160 (“4K”) screen has about 8.3 million. Each pixel usually contains several subpixels, so the number of individual light-emitting elements is higher still. Exactly how many depends on the subpixel layout.

Hair, skin and household dust

• Human hair looks like a translucent rod covered in overlapping scales (the cuticle), a bit like roof tiles. Pet hair often has a different scale pattern and a visible central core (the medulla). Mount a few strands dry, or in water, at 100x to 400x.
• Skin cells from your cheek, scraped gently with a clean toothpick, show up as flat, irregular cells with a central nucleus. They’re much easier to see with a stain. Our guide to methylene blue staining shows how.
• Household dust is a mixture of fibres from clothes and carpet, flakes of skin, hair fragments, pollen, mineral grains and sometimes insect parts. Pick some up with clear tape and stick the tape onto a slide.

Plants, pollen and cork

• Leaves: peel the thin skin from the underside of a leaf, or brush on clear nail varnish, let it dry and peel it off. You’ll see stomata, the paired guard cells around breathing pores.
• Pollen from lilies, hibiscus and many garden flowers comes in a surprising range of shapes: spiky, ridged, smooth or pitted. Tap it onto a slide and view it at 100x to 400x.
• Cork from a wine bottle, cut as thin as you can with a sharp blade, shows the box-like empty cell walls that Robert Hooke described in 1665 when he first used the word “cell”.
• Moss leaves are often only one cell thick, so you can view them directly in water and see the chloroplasts.

Insects, feathers and other small animals

• Insect parts such as wings, legs, antennae and compound eyes are best under a stereo microscope or at low power. A fly’s or bee’s compound eye is made of many small facets packed together.
• Butterfly and moth wings are covered in overlapping scales, like tiles.
• Feathers show a central shaft, side branches (barbs) and tiny hooked barbules that zip neighbouring barbs together.
• Fish scales from a fresh fish show growth rings, somewhat like tree rings.

Living things in water and moss

Some of the best viewing is alive. A drop of pond water, puddle water or the water inside a flower vase can hold algae, protozoa, rotifers and small worms. Our guide to viewing microorganisms under a microscope explains what to expect at each magnification. You can also grow your own with a hay infusion that cultures protozoa.

Damp moss and lichen often hide tardigrades, the eight-legged “water bears”. They are easier to find than most people expect; see how to find tardigrades in moss and lichen. Larger pond animals such as planaria are best watched under a stereo microscope.

For live specimens, a good wet mount makes a big difference. How to make a wet mount slide without air bubbles walks through the technique.

Things that are hard or impossible to see

Some popular questions have disappointing answers.

What does air look like under a microscope?

Air itself is invisible: the gas molecules are far too small for any light microscope. What you can see is what floats in it. Dust, pollen, soot and fibres settle on a slide left out in the open, or stick to a strip of clear tape. In wet mounts, trapped air shows up as perfectly round bubbles with thick dark rims and bright centres. Beginners often mistake these for cells, which is one of the most common microscopy artifacts.

What do mitochondria look like under a microscope?

Mitochondria are typically around half a micrometre to one micrometre wide. That is close to the resolution limit of a light microscope. In living cells at high magnification they may show up as faint, tiny dots or short rods, but you can’t see their internal structure. Labs make them clearer with specific stains or fluorescent dyes. The folded inner membranes (cristae) shown in textbook pictures come from electron microscopes.

Can you see viruses?

Not with a light microscope. Most viruses are far smaller than the roughly 0.2 micrometre resolution limit of ordinary light microscopy. Images of viruses come from electron microscopes. We explain this in more detail in how coronavirus looks under a microscope.

Which microscope shows what

You may see the question “what are the 7 types of light microscopes?” There is no single official list. Common categories include brightfield, darkfield, phase contrast, differential interference contrast (DIC), polarizing, fluorescence and stereo microscopes, though some lists also include confocal or digital microscopes. For everyday specimens at home, a basic brightfield compound microscope and a low-power stereo microscope cover almost everything above.

Getting better views

• Thin is everything for a compound microscope. Slice thinner, spread thinner, or tease the specimen apart with a needle.
• Adjust the light. Closing the condenser diaphragm a little often adds contrast to pale, transparent specimens, at the cost of some detail.
• Use stains for colourless cells. Iodine and methylene blue are the usual beginner stains.
• Keep the slides you like. Permanent mounting media and sealing let you build a slide collection.
• Take photos. Holding your phone camera to the eyepiece works surprisingly well. We cover this and clip-on lenses in whether you can turn your phone into a microscope.

If you’re exploring with children, see what kids can look at under a microscope for age-appropriate, low-mess ideas.