Someone left a note in our classroom, but forgot to put their name on it. In order to find out who this person was, the Green and Blue groups decided to have a look at their pens and test them against the note.
First of all we had to collect the pens from various members of staff to test.
We labelled the pens so we knew who they belonged to!
Which pen do you think wrote the note?
After making our predictions, we dissected the note to provide us with a sample to test, and in order to make it a fair experiment we wrote the same word with the pens we had collected.
Both the test word and the sample word were dipped in water and held up to allow the ink to spread.
Once all the pens had been dipped they were lay in a tray with their sample to compare. We looked at the colours that separated and spread from the ink, and we measured the spread to compare to our sample.
We found that some of the inks spread up to 7cm, however some inks did not run at all when they were put in the water. Some of the inks had a grey spread whilst others were blues and purples.
I wonder what would happen if you tried this test with other colour inks?
We will have similar experiments running this Thursday afternoon during our science fair, along with many other Light and Shadow activities.
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