PHydrion

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pHydrion is the trademarked name for a popular line of chemical test products, marketed by Micro Essential Laboratory, Inc., the original manufacturer of Hydrion and pHydrion products. The trademarked pHydrion product line comprises chemical test papers, chemical indicators, chemical test kits, chemical indicator kits, pH indicator pencils, chemical buffers, buffer salts, buffer preservatives, dispensers, color charts, and testing products, for use in testing, detecting, identifying, measuring, and indicating levels of pH, of sanitizers, and of other substances.

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Hydrion is a trademarked name for a popular line of compound pH indicators, marketed by Micro Essential Laboratory Inc., exhibiting a series of color changes over a range of pH values. Although solutions are available, the most common forms of Hydrion are a series of papers impregnated with various mixtures of indicator dyes. It is considered a "universal indicator".

MilliporeSigma is an American chemical, life science and biotechnology company, before 2014 known as Sigma-Aldrich, owned by Merck KGaA.

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Inwood Laboratories Inc. v. Ives Laboratories, Inc., 456 U.S. 844 (1982), is a United States Supreme Court case, in which the Court confirmed the application of and set out a test for contributory trademark liability under § 32 of the Lanham Act.

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