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CHEMISTRY : Chromatography

Dyes: Sky Blue 01



PROJECT CODE: 04.21
SECTION: CHROMATOGRAPHY
PROJECT TITLE: Dye characteristics: Sky Blue 01
RELEASE DATE: 20 Feb 1999 - 21 Feb 1999
LAST UPDATE: 2 Sep 2009
VERSION HISTORY: 1.0 - First release
1.1 - Revision of text and formatting. (2-Sep-2009)



PHYSICAL EXAMINATION:


Dye nick name: SKY BLUE 01
Scientific name: (not yet identified)
Colour: Cyan-Blue
RGB colour Code : Red:Green:Blue = 40:D8:F0
(Same as background of this cell)
Soluble in Water: NO
Soluble in Organic Solvents: YES
Most soluble in: Propanone
Least soluble in: TetrachloroMethane
Effect of heat while in solution: None, heat stable till 100C
Rf Value in 60% Ethanol: Rf Top = 0.84 ; Rf Center =0.77
Rf Value in 60% Propanone: Rf Top = 0.75; Rf Center = 0.65




CHEMICAL TESTS:


Reagent added Colour change
Hydrochloric Acid: Violet
Sulphuric Acid: Violet
Nitric Acid: Violet
Sodium Hydroxide: Colourless (Blue-Green-Yellow-Colourless)
Ammonia solution: Colourless (Blue-Green-Yellow-Colourless)
Sodium Sulphide: Colourless (Blue-Green-Yellow-Colourless)
Others: n/a




NOTES and OTHER CHARACTERISTICS

  1. It is often the accompanying dye in blue inks together with the Fast Violet 01 dye
  2. Normally found in a less amount from the fast violet dye.
  3. Turns colourless in alkalis, and violet in acids hence acting as a pH indicator?
  4. The violet colour formed with the acids is similar to the dye Gentian Violet.

TENTATIVE IDENTIFICATION:

Not yet identified - could be a derivative of the dye Methyl Violet, since of the similar colour produced in low pH.






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