[Rickyb03]

I was using the method described in
"https://www.canterbury.ac.nz/media/documents/science-outreach/vitaminc_iodine.pdf"
but used fresh pineapple juice instead of orange juice.

During titrations, I noticed that the colour of the analyte would change after some time.

Instead of remaining as dirty green the colour of the analyte would change to a dark yellow after around 30 minutes.
What could be the cause of this change?