Skip to content
World 3 · Ink Chromatography · 11 min · PRO

Rf values: putting a number on a colour

A ratio of two distances you can measure with a ruler

PRO · Forensic Science

World 3: Ink Chromatography is part of PRO

The first world of Forensic Science is free. PRO opens the other 22 lessons in 6 worlds — simulations, quizzes and all.

  • Splitting a colour: how paper chromatography works
  • Which pen wrote the note? Comparing inks
  • Reading a footprint: what the shoe says
  • From foot to height: estimating a person
  • Stride and speed: walking or running?
PRO includes
  • All 60 labs — every world, every lesson
  • Practice exams and certificates

$8.33/mo, billed yearly ($99.99) · or $39.99 monthly

Unlock Forensic ScienceTry the free world
My notes
Only saved in this browserAll my notes →
← Splitting a colour: how paper chromatography worksWhich pen wrote the note? Comparing inks →

Report a mistake

What is wrong?
0 / 2000 · at least 10 characters
Sent along with your report
  • Page
  • About Rf values: putting a number on a colour — Forensic Science · forensics/rf-values
Plus your browser type. Reports go to our support system; see the privacy notice.