a mineral can have more than 1 color and more than 1 mineral can have the same color
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Many soluble dyes change their color with changes in pH (a measure of the concentration of acid in a solution). Such dyes may be used to indicate when the acid (base) in a solution has been neutralized by addition of an equal amount of base (acid). Each indicator dye has a particular range of pH for which it is useful. pH test strips and papers often incorporate two or more dyes to extend the range of pH over which they can be used. The best indicator dyes are strongly colored (so that only small amounts are needed), undergo an easily seen change with pH (either from one color to another, or from clear to colored), are nontoxic, and are chemically stable.
cellulose and starch !
type and distribution of fossils
The best indicator of wealth is typically determined by how a person carries themselves. A wealthy person will generally walk with confidence.
Jjjjj
The best indicator for current weather is a barometer because it tells you if there is rain or if it is sunny.
onion
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Stochs
Cellulose cell wall is the best indicator of plant based substance.
GDP
Creatinine level
lichen
Aspire.
biological indicator of air pollution is lichene. it is a best example of air pollution indicator.
methyl orange