This is a pH indicator.
An indicator
Chemical
An indicator refers to a substance that changes color to show how a given substance is either acidic or basic.
Indicates whether the substance is an acid or alkali.
A mood ring is a ring which contains a thermochromic element, such as liquid crystal. The ring changes color in response to the body temperature of its wearer. The color is said, by some proponents, to indicate the emothional state of the wearer.
Indicators
no we cannot everything changes with time even a pure substance looses it's some of the properties after some time so the color also changes .
It is an indicator. If you don't know the answer check your science book.
An indicator
Indicators such as litmus paper
Indicators such as litmus paper
Chemical
An indicator refers to a substance that changes color to show how a given substance is either acidic or basic.
.
Plants receive their green color from a substance called chlorophyll found in their organelles called chloroplasts.
It changes it color because of special cells called "chromatophores". These chromatophores contain sacks of color pigments.
it's called a chameleon's.