Several ideas that have worked for me:
1. Using an old metal muffin tin, put pieces of crayons in the cups. Melt
in the oven
(probably 325 degrees), keep a close watch on them. When cool, pop them out
and you have crayon chunks. Works best to keep similar color tones together.
2. Using warming trays (the type we used to keep casseroles warm during
place a sheet of wax paper on the warmed tray. Have the students draw with
the crayons. The warmth of the tray melts the crayons. Place another piece
of wax paper on top to seal the picture inside. The trays can get very warm
if left on for any length of time, not enough to burn, but a safety warning
should be given to students.
Have fun! Jean in Michigan