One of my favourite experiments to do with the younger students when I taught secondary school science was Chromatography – of course in my lab I had all of the equipment I needed including filter paper, different mixed up inks and solvents to use. But it’s so easy to do at home and my kids were fascinated by this very simple Kitchen Science experiment, science at home is so much fun and we’re taking part in the A to Z of science organised by Frogs Snails and Puppy Dog Tails this month check out all of the details for more at home science with kids.

Simple Ink Chromatography experiment for kids to do. So easy that it can be done at home. Separate the colours of the black ink and see what colours it actually is.

 

When we were painting the kids asked for black paint and unfortunately we had run out of it and that we could mix it up – I said yes but it’s not easy to make as black isn’t really a colour and neither is white so I set about proving it to them with a black pen to see what colours it was actually made up of.

Materials needed for this Simple Chromatography Experiment

Glass

Water

Paper Towel

Water Soluble Marker Pen (any washable marker) – black plus other colours of your child’s choice

How to do this Paper Towel Chromatography Experiment

Chromatography experiment for kids to separate the colours of ink with water as a solvent.

 

With a kitchen paper towel we cut up 3 strips and selected 3 different coloured marker pens – a black plus a pink and a purple.

I explained that we were going to split the ink in the pens into the different colours that it was made of using a method called chromatography and then I asked what they thought would happen. My eldest said that the pink would split into a white and a red cause that’s what made pink, the younger one joined in and suggested that purple would be red and purple. But black was black and from trying to make the colour with their paints they couldn’t do it.

easy science at home experiment with kids to investigate the colour of black ink in this simple paper towel chromatography example.

On the strips of paper towel I drew a circle around an inch from the bottom for them to colour in with the different colours and filled up a glass with around 1/4 inch of water.

 

They then put the paper towel into the water – make sure that you don’t let the ink spot touch the water and we folded the paper over the glass to hold it in place.

paper towel chromatography experiment using kitchen equipment and kids markers

pink ink separation using chromatography a simple science experiment to do with kids

easy kitchen science experiment to separate the colours of different washable inks with chromatography

 

As we watched the water travelled up the paper towel through the ink spot – as it went up through the ink spot it split the colours that made up the different inks and headed up the paper.

Paper Towel Chromatography Experiment for Kids to do at home - simple science that uses kitchen equipment

 

When the ink had travelled to the paper at the top of the glass we removed it and placed it on a sheet of white paper to dry and then looked at the colours.

Simple experiment to look at chromatography and discover what colour is black ink

 

The Purple ink was a true purple, the pink was made up of different colours of pink and red that travelled different distances but the black ink was the most revealing and the kids loved looking at the dried paper towel.

Paper Towel Chromatography - A to Z of science for kids

How Chromatography works

As I said I used to teach this with my secondary school students – using different ink mixes – black ink works really well as an example because it is made up of different colours – each of the colours has a different polar value.

With paper Chromatography, the paper is non-polar none reactive to the water solvent as it is made up of cellulose. When the ink meets the water the more polar the colour is further it will travel through the paper in our example the red is the least polar staying near to where the black spot was – the yellow the next and then the blues most polar travelling up the furthest from the black spot.

Try these other easy Science Experiments to do at Home

Growing Crystals without Borax

Exploring Plant Structure with Celery

Seeing how roots grow with beans in a jar experiment

Testing Materials – what makes balls bounce

Energy transfer with a cotton reel car

Viewing the Constellations – with a show box viewer

Exploring how colours are made (no mess experiment using light)

Sea Turtle Conservation Lessons away from the Beach

Extending

A great extension of the experiment is to collect all of the different makes of black ink washable markers that you have in the house and repeat the experiment to see what different colours each of the inks are made from.

A-Z-Science-Experiments-for-kids-994x1024

Don’t forget to check out the rest of the A to Z of Science Experiments for kids at Frogs and snails and puppy dog tails.

Pin this Simple Paper Towel Chromatography Experiment to Do Later

Simple Paper Towel Chromatography Experiment to do with kids to explore what colours make up black ink.

 

Author
Cerys Parker

Cerys is a marine biologist, environmental educator, high school teacher and mum. Realising that life doesn't have to be put on hold and you don't just have to survive whilst the kids are young she shares ideas to inspire you to LIVE with the kids, with activities to do together, recipes to cook and enjoy and family travel to make memories to last a lifetime.

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