I really like your reasoning as to why you did this experiment -- you were curious and wanted to see if it truly works or not. That is, after all, a key component into the scientific method: asking questions then conducting an experiment! Now you could maybe expand on this and perhaps relate it to something such as the affects of acids on teeth by using eggs as a replacement. It seems like you had a lot of fun with this experiment and the results are fun to play with as well, which makes this experiment useful in it's own way!