HOW TO COPY THE SHAPE OF A KEY?

Lets see how we can copy the shape of a key!!

*TO BE PERFORMED ONLY ON A SUNNY DAY...

Materials Required

1) 2 or 3 pieces of black construction paper

2) Tape

3) Some old keys

4) Scissors

Instructions

Cut the construction paper into pieces of 3 inches by 3 inches.

Find a place outside with strong sunlight where nothing would disturb your experiment.

Put the papers outside tape the corners of the paper or put a heavy object on the paper so the wind cannot move it.

Place a key in the center.

After 4 hours remove the keys. You would see impression of the keys

HOW TO MAKE A FOOTPRINT CASTE?

Have you ever tried to make a plaster caste of a foot print? Lets try!!

Materials Required:
1) 1 Empty 2 lb coffee cans with lids (3-lb cans can also be used)
2) 1-lb plaster of Paris
3) Water
4) A wooden mixing Stick
5) 1 cup measurer
6) A screwdriver
7) 1 magnifying glass

Instruction

Make foot prints on dampened soil outdoor with a clearly patterned shoe sole, and choose the clearest and deepest footprint for the cast.

Put three cups of Plaster of Paris into a coffee can and add two cups of water to the can and mix well with the wooden stick. The plaster should be as thick as melted ice cream, let it stay for a few minutes.

Now pour the plaster of Paris gently into the footprint, let it flow over the edges.

With a twig write the date, location on the wet plaster.

Wait for 20 to 30 minutes, until the plaster hardens. Once it hardens gently dig around its edges with a screwdriver and take it off.

Your footprint caste is ready!!