Combine alginate and water in a container, insert your hands and hold them in place until the mixture sets. You have now made a mould of your hands.
Mix up special plaster and pour it into the mould. Let the cast dry completely.
Glue the plaster hands to a wooden tray. If needed, carve out the cast hands with a hobby knife. Fill in any empty spaces with air-drying clay. Let dry.
Spray paint the hands white, then spray paint the outsides of the hands and the tray black.
Place a big lightbulb, complete with a cord, inside the plaster hands as a crystal ball.
Foresee all the demonic horrors of Halloween with a mysterious crystal ball! Add severed plaster hands, spider webs and creepy-crawly insects for a spine-chilling atmosphere tinged with black magic. Then simply transform into a witch, wizard or mysterious fortune-teller for your Halloween party and scare your guests with ghastly predictions!