What failed experiment were you most disappointed by?

Question: What failed experiment were you most disappointed by?
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Asked by bhollyb to Michael, Jesus on 16 Nov 2015.
- Jesus Calvo-Castro answered on 16 Nov 2015:
  
  Hi @bhollyb. I think in my case it was trying to measure the experimental oxidation and reduction potentials of some thin films…it was really hard to find the appropriate solvent! I thought it was going to be really straight forward but it took some time

Question: What failed experiment were you most disappointed by?