Lum Eisenman wrote:
Very interesting post Droopy.
Thank you.
Could you provide a reference for "anthocyanins being a reducing agent for
copper?"
Lum
Del Mar, California, USA

I do not know of any specific research. I was speaking of more general
chemistry knowledge (I use a copper reduction assay all the time to
determine protein content in samples, and there are a lot of
interfering substances).

I did look around and found an ACS article on standardized methods to
determine levels of "antioxidant phenolics" which anthocyanins are.
they describe a copper reduction assay in it.

http://tinyurl.com/qdans

I have not read it to determine if it is a probable problem in using
the clintest with reds though....but to me at least it seems very
liekly.