They were doing something that had to do with how things dissolved so they naturally gathered a ton of things that might or might not dissolve and did a little experiment. (along with everyone guessing as to what would dissolve & what wouldn't.)
Go science! am I right?
Ha. look at those fingers. Still have lots of egg dye on them. It's taken weeks to get through all of the dye and you wouldn't even believe how many hard boiled eggs! They finally started in on clothes pins. Same dif. *shrug