so I've been doing more thinking in case this experiment fails,or when researching, i find plan A very difficult and confusing. so, other ideas I've had include:
- does temperature affect density
- what type of acid (e.g. vinegar, orange juice, etc) has the most effect on egg shells
- what type of solution best protects egg shells from acids
- what solvents (e.g. water, alcohol, vinegar,etc) will remove permanent marker ink best

note: these experiments are backup plans