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===Examples===
{| class="wikitable"
|+ These are the colour ranges of different '''indicator''' plants.
|-
|[[File:NaturalIndicators.png|center|600px]]
|-
|}
==Key Stage 4==
===Meaning===
An '''indicator''' is a [[dye]] that changes [[colour]] when other [[chemical]]s are present.
===About Indicators===
: Some [[indicator]]s detect [[pH]] but others can be used to detect other [[chemical]]s.
Some non-pH '''indicators''' you should know:
*[[Iodine Solution]] - Used to detect starch.
*[[Biuret Solution]] - Used to detect proteins.
*[[Benedict's Test|Benedict's Solution]] - Used to detect simple [[sugar]]s like [[glucose]].
*[[Limewater]] - Used to detect [[Carbon Dioxide]].
===About pH Indicators===
: The [[colour]] of a '''pH indicator''' can be used to tell the [[pH]] of a [[solution]].
: Different '''indicators''' will have a different range of colours for different [[pH]] values.
: A good '''indicator''' can be added to [[solution]] without affecting the [[pH]] of the [[solution]]. If an '''indicator''' change the [[pH]] of a [[solution]] it could not give an [[accurate]] [[reading]].
Some '''pH indicators''' you should know:
*[[Litmus Paper]]
*[[Red Cabbage Indicator]]
*[[Universal Indicator]]
*[[Phenolphthalein]]
*[[Methyl Orange]]
*[[Bromothymol Blue]]
===Examples===
{| class="wikitable"
|+ These are the colour ranges of different '''indicator''' plants.