A visual blood glucose test strip has two membranes that each incorporate a reagent that reacts with glucose in a blood sample applied to the membranes to cause a color change. One of the membranes also includes an inhibitor and a dye. A blood sample applied to the strip causes the two membranes to form...http://www.google.com/patents/US6531322?utm_source=gb-gplus-sharePatent US6531322 - Visual blood glucose test strip
