Janet B. Matsen:Formaldehyde Preparation

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Make a 1M stock (30 mg/mL) using paraformaldehyde (Sigma P6148) in a small glass vessel (under 10 mL):

  • seal it with a rubber stopper and an aluminum seal, which is crimped around the stopper to be airtight.
  • autoclave at 121 deg F for 8 min on the liquid cycle.