http://www.beckersasc.com/gi-endoscopy-driven-surgery-centers-to-know-2013/5-big-endoscope-reprocessing-risks-in-ascs-how-to-avoid-them.html
When getting test strips out of a bottle the reagent pad may appear slightly purple instead of blue. This is ok, the color of the reagent pad out of the bottle does not impact the testing.