An easier, if slightly more expensive, solution might be to use the
powdered colored chalk that's sold for use with carpenters' chalk lines.
 
 
Michael R. Thigpen
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        "There is no money in poetry, but then there is no poetry in
money, either."
                *Robert Graves*
 
On Fri, 10 Nov 1995, John Day wrote:
 
> colored powder can be easily obtained by using colored
> chalk (like blackboard chalk), putting it into a sock
> and beating it with a rock or hammer into a powder.
>
> john
>