Students use chromatography to separate the colours in black ink.
The unique colours in different black pens can be used to identify which pen was used to write a note.
Science content (2016 curriculum):
Chemistry: Physical Changes, Solutions, Mixtures and Separating (2, 4, 5, 6)
Science topic (2005 curriculum connection):
Physical Science: Properties of Objects and Materials (grade K)
Physical Science: Properties of Matter (grade 2)
Physical Science: Chemistry (grade 7)