nobody here carries Pumice powder of the type or coarseness that
we use at the Art College.
Hi Danny, While I can't be sure of they type or coarseness of the
pumice powder you used in school, I can pick it up locally at any
True-Value hardware store. It is usually found in the area of
painting supplies. I suspect any full service hardware store will
have something. Whether or not it meets your expectations for pumice
is another matter...
All the best,
Sebaste Studio and
Carolina Artisans' Gallery
Charlotte, NC (USA)