| abstract |
The device, for use in analysis of a sample of liquid material applied thereto, comprises a plastic film support having adhered to one surface thereof a reagent-containing layer, said reagent reacting with a component of said sample to produce a color change within said layer, said layer also containing reagent-free particles of hydrophilic, absorbent, porous, particulate material, adhered to said surface, and on the opposite side of said reagent-containing layer from said support, a layer of a porous medium through which some of the said component is transmitted to said reagent-containing layer. |