On Oct 27, 2011, at 1:12 PM, Andy wrote:

I've been downstairs to my workbench since my earlier post, and
what did
I find but a different brand of pencil that I've also used for chalk
marks. It's a Lyra Rembrandt-Polycolor made in Germany. It's white,
and
works equally as well as the Prismacolors, which I also have. Someone
will want to ask if there's a price difference, but I honestly don't
remember. So I'd say to try whatever make of pencil you can find, and
don't be hung up on one brand.

A word of caution. If Andy says "Brand X" works fine, then he's
doubtless right. But in my experience, not all brands of artists'
pencils work equally well. So don't buy indiscriminately. Try the
brand of pencil you're offered by applying chalk marks to a freight
car before you make a sizable investment.

Richard Hendrickson