Hydrion paper
Encyclopedia
Hydrion
(Multiple color changes, varying by product)

Hydrion is a trademark
Trademark
A trademark, trade mark, or trade-mark is a distinctive sign or indicator used by an individual, business organization, or other legal entity to identify that the products or services to consumers with which the trademark appears originate from a unique source, and to distinguish its products or...

ed name for a popular line of compound pH indicator
PH indicator
A pH indicator is a halochromic chemical compound that is added in small amounts to a solution so that the pH of the solution can be determined visually. Hence a pH indicator is a chemical detector for hydronium ions or hydrogen ions in the Arrhenius model. Normally, the indicator causes the...

s, marketed by Micro Essential Laboratory
Micro Essential Laboratory
Micro Essential Laboratory, Inc., founded by Walter Florin in 1934, is a manufacturer and global supplier of Hydrion pH Test Papers, Sanitizer Test Kits, pH Buffer Standards, and Specialty Test Papers. The company is the original manufacturer of Hydrion and pHydrion pH products.- History :Micro...

, Inc. exhibiting a series of color changes(typically producing a recognizably different color for each pH unit) over a range of pH
PH
In chemistry, pH is a measure of the acidity or basicity of an aqueous solution. Pure water is said to be neutral, with a pH close to 7.0 at . Solutions with a pH less than 7 are said to be acidic and solutions with a pH greater than 7 are basic or alkaline...

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".

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