On Monday we had a science experiment with MRS O’B .
To do the science experiment we need candle , black pen , frixion pen ,and piece of paper.
With black pen on piece of paper we had to write our secret message and colour with friction pen over the top.
Next we lit the candle and held your paper above the candle. . When the paper heated you could see your message. Why can you see a message? Do you know?
In cup again put a hot water when you get your paper with a new secret message. Put it on the hot cup. You can see the secret message again!
Making things disappear
Toroa did a science experiment yesterday with Mrs O’B (our science teacher). The science experiment was called “making things disappear.”
My partner was Sam and we were going to; write a secret message, then scribble it out with friction-pen, after we put it over a candle and see what happens.)
First I wrote a secret message in ball-point pen and covered it up in friction pen ink and Sam did the same after me.
After that Sam lit the candle. Sam and I held our paper over the candle and moved it backwards and forward. It only took a couple of seconds and our messages were revealed because the friction-pen has a special ink.
When the ink gets over 60 degrees celsius it evaporates away (?) and fire is hotter than 60 degrees.
Next we did another experiment. For this experiment we tried to rub out the friction-pen ink with a rubber. So again we wrote our secret message in ballpoint pen and scribbled it out in friction-pen. Then we use different types of rubbers to try and rub out the friction pen to reveal a message, none of the rubbers worked though.
While Sam and I were doing this the other group (who got the other piece of paper) were testing if you could write your message in ballpoint pen and scribble it over with frixion-pen and rub on the side of a polystyrene cup and a glass cup. This way worked but eventually the writing would reappear. We all wondered how that happened. I thought this happened because it wasn't as hot as the candle and it didn't evaporate fully and the ink was still in the air and came down once the paper had cooled down.
I also wonder what would happen if you did it so you wrote your message in friction pen and scribbled it out ballpoint pen?