Hydrion paper
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Hydrion (compound pH indicator) |
(Multiple color changes, varying by product) |
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Hydrion is a trademarked name for a popular line of compound pH indicators, marketed by Micro Essentials Laboratory, exhibiting a series of color changes (typically producing a recognizably different color for each pH unit) 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.