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As paper-based devices' detection chemistries be complex, harder devices are needed, frequently entailing the sequential distribution various liquids or reagents to reaction zones. Most study into flow-control has been focused on introducing delays. However, delaying the flow may be challenging because of increased evaporation leading to test loss. We report the application of a CO2 laser to uniformly etch the surface of the report to change wicking rates in paper-based microfluidic devices. This technique