The reprocessing of reusable medical devices is vital to protecting patient safety. Earlier this year, the FDA recently updated their guidance for Reusable Medical Devices which can be found on the FDA website.
https://www.fda.gov/medical-devices/products-and-medical-procedures/reprocessing-reusable-medical-devices
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.