He tested different items in the kitchen to see which ones glowed under the blacklight. Honey, peach juice, a white tablecloth, and plastic spoons all glowed under the light. It was interesting to investigate the dirty dishes and see what hidden evidence the light showed.
The plastic spoons seems to transmit light through them in a particular direction, which reminds us of fiber optics.
Griffin also made a diluted laundry soap solution so that he would have something that glowed well. Some types of liquid laundry soap have additives to make your clothes look brighter, which could be why they glow under the light. You could probably paint secret messages on paper that are only visible under the blacklight. (Remember to read the safety info on the bottle and keep out of reach of small children.)
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