1.Remove all the membranes from shells.
2. Crush and grind the shells to a fine powder.
3. Mix in two parts flour or plaster of paris
for every part shell powder
4. Mix in enough water to make a stiff paste.
5. Mould into shape.
6. Wrap in plastic and leave
HINTS: For coloured chalk add powdered paint before the water.
Clean, dry egg shells keep well - so save them up for a big batch!
