Have you ever mixed up one of the tubes that you where testing ???.If so which ones ???.

Question: Have you ever mixed up one of the tubes that you where testing ???.If so which ones ???.
- Keywords:
  experiment,
  research
Asked by exit44zip to Min on 11 Nov 2019.
- Min Yap answered on 11 Nov 2019:
  
  Thankfully no! I do sometimes confuse tubes that are labelled 6 and 9 though, because they are so similar when seen upside down. It’s so important to label tubes well.

Question: Have you ever mixed up one of the tubes that you where testing ???.If so which ones ???.