The present invention is directed toward a colorimetric detection kit comprising a unit containing chemical reagents and a sample collector for collecting a sample analyte from a surface and a separate unit for visualizing a possible reaction of the chemical reagent and sample, the unit holding the chemical reagents and sample collector being placeable on the visualization unit, whereby when the chemical reagents are released, they are directed onto the sample collector for reaction and the reacted reagents absorbed on a visualization media, such that the presence of a specified analyte in the sample results in a color change in the visualization media.