Chlorophyll chromatography on chalk?

[Dorothy Klein]

	Does anyone know of a solvent system to separate
chlorophylls/plant pigments using a piece of blackboard chalk as
the chromatographic support?  Twsett, around the turn of the century,
is credited with separation of chlorophylls on chalk.  
However, the origianl reference is in turn-of-the-century Russian.
Is there a modern update?

Dorothy Klein  
D.E. Eveleigh
Rutgers Univ, Dept. Biochemistry and Microbiology