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Test device and method of determining concentration of a sample component

  • US 4,772,561 A
  • Filed: 12/23/1985
  • Issued: 09/20/1988
  • Est. Priority Date: 12/23/1985
  • Status: Expired due to Fees
First Claim
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1. A test article for detecting a relative concentration of a test compound in a test fluid comprising a liquid-absorbent or liqudi-adsorbent dry reagent carrier having homogeneously incorporated therein a regent composition capable of forming a primary color upon interaction with the test fluid to produce a change in the light reflectance of the carrier, and a secondary, inert colorant marker homogeneously incorporated into the carrier or the test fluid in a predetermined concentration, said colorant marker being inert to the test fluid and to the reagent composition and wherein the secondary, inert colorant marker has a light absorption wavelength peak different from a light absorption wavelength peak of the primary color by at lest 80 nm.

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