[header] How to make rainbow jello [title] Select a tray or baking pan. [title] Clear a spot in your refrigerator large enough to accommodate the pan. [title] Set clear plastic cups in the pan or tray. 
[title] Prepare one batch of jello according to the directions on the packet. [step] For an authentic rainbow effect, start with red and work your way upwards through the color spectrum (or choose purple and work downwards).