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304L discoloration based on temperature data

Is there a way to determine what temperature a flex hose made of 304L has been exposed to? Specifically, is there any way of looking at the color of convolution portion of the flex hose and determining the approximate temperature range. I have a flex pipe inner convolution that should have only been exposed to temperatures < 700 F. However, it exhibits a purplish color and I seriously doubt about temperatures being <700F.
I would really appreciate an answer as soon as you can on this topic.
Thanks,

Julio Mestroni
engineering - Marietta, GA, US
2005

Temperature is only one variable in color- Time, total heat, oxygen and surface contaminations like chlorides and organics will also affect the color.

James Watts
- Navarre, Florida
2005

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