(chemistry) a substance that changes color to indicate the presence of some ion or substance; can be used to indicate the completion o…
Used in the same subject area: Chemistry, Environmental science, Environmental ecology.
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Litmus
A dyestuff extracted from certain lichens (Roccella tinctoria, Lecanora tartarea, etc.), as a blue amorphous mass which consists of a compound of the alkaline carbonates with certain coloring matters related to orcin and orcein.
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