Place six jar lids onto a flat surface. Make sure that the jar lids are clean, dry, free of residue and debris.
Squeeze tempera paint into each lid, using one color per lid. For example, squeeze red tempera paint into one lid and yellow tempera paint into a separate lid. Repeat this with orange, green, blue and purple tempera paint.
Dip a paintbrush into the lids in order to use the paints.
Cut out a circle from heavy duty freezer bag for each lid. Make sure to adjust the measurements of each circle so that it is 1 inch wider than the lid.
Place a plastic bag circle over each lid and wrap a rubber band around it to secure the circle onto the lid. This will ensure that the tempera paint does not dry out when you are no longer painting.