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It's not everything, but when he sniffs something he sort of slowly clenches his teeth up and down, sort of like slow motion chattering of the teeth...it's hard to describe but at first i thought he was weird because it seemed to do it when he would go up to smell peoples' privates parts when...

1. What makes up black ink? 2. Why could chromatography be used in investigating the crime? 3. How could the results be applied to solving the crime?