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CHEMISTRY : Chromatography

Sample Analysis INK-001:
- Corvina "91" (universal) -

PROJECT TITLE: Analysis on Ink Sample 001
RELEASE DATE: 01 Jan 99 - 07 Feb 99
LAST UPDATE: 2 Sep 2009
VERSION HISTORY: 1.0 - First release
1.1 - ? (20 Feb 1999)
1.2 - Revision of text and formatting. (2-Sep-2009)


Source Ball-Point ('Biro') Ink
Sample Description or
Commercial Name
Corvina "91" Universal
Sample Colour Dark Blue
Solvents Tested 65% Methanol
60% Ethanol
60% Methanoic Acid
60% Propanone
Absolute TetrachloroMethane
Absolute Chloroform
Absolute Butanol
Source of Sample Ink - Corvina 91 Ballpoint


Rank Solvent Name No of Separated Dyes Zones formation Pattern Description Picture
1 65% Methanol 2 Oval Zones up: Violet
low: Cyan
2 60% Ethanol 2 Round Zones up: Violet
low: Cyan
3 * 60% Methanoic Acid 2 Round Zones up: Violet
low: Cyan
4 60% Propanone 2 Round Zones up: Violet
low: Cyan
5 * 100% TetrachloroMethane 2 Flame like streak from PA tip + border of streak: Cyan
lower + central area: Violet
6 100% Chloroform No Separation Long Streak Blue (x) no
7 100% Butanol No Separation SemiCircle T Blue (x) no
LEGEND : (See picture for diagramatic representation)
  1. O - Separated - sample components separated into distinct circular-oval zones well spaced apart.
  2. B - Semi separated - sample components exhibits themselves as zones intersecting into each other.
  3. U - No Separation - sample forms an elongated streak usually from origin.
  4. T - No Separation - sample moves with solvent front forming a flat edge with level of solvent.
  5. X - No Separation - sample undissolved and remains at the original point of application.

  6. PA - Point of Application (Origin)
  7. * - Further remarks and details below.


* 03: 60% Methanoic Acid.

This made the dye zones turn to a green colour on the strip, which after drying, they turned to their original violet + cyan colour. When some of this ink was mixed and dissolved in some acid in a test tube, a light green solution was formed.

* 05: 100% TetraChloroMethane

This produced a flame-like streak, about 30% long of the paper strip with the solvent level much higher (about 85% of the strip length). This streak was formed from the point of application.

The main interesting feature is that this is the only solvent which formed the cyan colour above the violet colour.


Ink in Sample INK01 - "Corvina 91" consists of two dyes:
  1. FAST VIOLET-01 - (approx: 60%)
  2. SKYBLUE-01 - (approx: 40%)
Names given to the dyes above are not the actual scientific names but nicknamed by me for reference in these documents. Further reaserch will perhaps reveal their proper names, but it is difficult to identify the actual dyes.

Quantities by sight estimation of the separated dye zones on the chromatography papaer.

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