A test device for detecting the presence of protein or other reducing compound wherein a bicinchoninic acid or salt composition is in a sampling swab (27) on a sampling wand (17) is separate from a dried cupric salt on a disc (48) in an essentially transparent well (45) . The reaction of protein with the cupric salt in the well in the presence of the composition reduces Cu to Cu+1 which forms a deep purple complex with the bicinchoninic acid or salt and which can be detected visually or by a spectophotometric device (10) or other detection instruments. The result determines whether or not surface is contaminated with protein or other reducing compound and thus is unsanitary.
