.....
9a What happens to black felt pen colours in paper?
( Makrochemie: Chemie heute S1,  2001, S.15)
In experiment 7 a black line of a felt pen was drawn to the lower part of a wick. The line was separated into different colours by methylated spirit climbing up the wick.
In the following experiment you will draw circles on filter papers to be placed on the top of wicks.
As Stabilo is water-soluble you can also replace methylated spirit by water.
Material:
Black felt pens (Edding, Pentel, Stabilo, Rotring). Micro burner inside infusion bottles 50 mL, 5 small round filter papers, pencil, coin.
Experiments:
1. Draw circles on filter papers with different black felt pens using a coin.
2. Use a pencil to write the type of pen on the backside of the paper.
Left: 3. Draw a half circle using a Stabilo pen. Complete the name  "Stabilo" by a pencil
4. Pull the wicks out of each Liquemin bottle as much as needed to touch the filters placed on the infusion bottles around them.
5. Place the filter papers on the wicks: Starting from their centers liquid will spread in the papers.
Observation? Explanation?  A detctive could use this method to convict a forger?


back................go on.........,,.............................,,,,,,,,,................. .....................last modificationg: 31.10.2002