colonoscopy, why no red or purple liquids?!

Question: The directions for cleansing warn you not to ingest any red or purple liquids,why? How does it affect the colonoscopy?
Answers:
To avoid causing a stained area that could be mistaken for reddening of an inflamed area.

Other Answers:
I was told they might think it is blood.

Answers:

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colonoscopy, why no red or purple liquids?!

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