Edexcel Gcse Chemistry/additional Science - Unit C2: Discovering Chemistry Page 15
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(c) A written note was found at a crime scene.
Forensic scientists used chromatography to
investigate the dyes in the ink used to write the note.
They put spots of four substances on
chromatography paper.
W was pure red dye
X was pure blue dye
Y was pure yellow dye
Z was the ink used on the note
The result of the chromatography is shown.
position of
• • • •
initial spots
W X
Y
Z
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