There is nothing that can cause a milky appearance due to mixing formaldehyde and acetic acid. You must have a contaminant or another substance in that mix. By themselves formaldehyde + acetic acid do not produce any color or precipitate.
  René J.

Jennifer Johnson  wrote:
  
Does anyone know of the top of his/her head what the chemical reaction is between formaldehyde and acetic acid that causes the milky white turbitity? 

Thanks,
Jennifer
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