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Micro-PADs produced using chromatography paper by (A) printing the pattern with an ink-jet printer, (B) printing the pattern with a photocopy machine, and (C) drawing the pattern through a stencil using a waterproof black pen. A μPAD patterned using sunlight (D). A μPAD from Technicloth (E), or a paper towel (F). The devices were filled with an aqueous blue dye (1 mM Erioglaucine).
