Kid Science | Turkey Bone in Vinegar

We have a lot of books about kid stuff--crafts, experiments, activities, etc.  We found this experiment in one of our Kid Concoctions Books.

All you have to do for the experiment is cover a chicken bone with vinegar for a week (or more). 
 It is supposed to become "rubbery".  We used a Turkey leg bone, so it actually took ours about 3 weeks before it started working.

We checked it yesterday.  Here are our pics.  After 24 hours of being out of the vinegar, it started hardening up again.  I didn't realize it was going to do that!
I think we'll try an egg in vinegar next.  That experiment sound really cool!  Which science experiments with vinegar have you done?

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