Selected a few sturdy/interesting types of leaves and using white glue I
glued them to a non-porous surface(flat).
Set up walls arount the leaf-you can use clay or wood mold boards and
Mix plaster and pour over the leaf-use a brush to free any air bubbles
or tap the surface of the table to let bubbles rise-gently-you don't
want to disturb your walls and have plaster all over.
Let this set up and demold(peel out the leaves) when plaster is hot or
cooling down-you can wait longer- it just depends on the time you have
to do this in. Depending on the impressions-you can carve into the mold
further if you like. You only need a couple of these molds since the
kids will be making impressions into them.
Let the kids make impressions into the molds with white clay and peel
them out carefully. Dry . (you can also bisque fire at this stage for
stability) Let the kids use watered down ceramic stains/oxides to
create colorful fall leaves.Glaze and fire. mount on a piece of colored
concepts you may want to cover- chemical reactions of plaster, how
fossils are created
sorry for the brevity of this but it is just off the top of my head-if I
missed anything or you have ? email me.