PH indicator
Videos
A pH indicator is a halochromic chemical compound added in small amounts to a solution so the pH of the solution can be determined visually or spectroscopically by changes in absorption and/or emissio
pH measurement with indicator paper
Hydrangea in acid soil
Hydrangea in alkaline soil
A gradient of red cabbage extract pH indicator from acidic solution on the left to basic on the right
Chromophore
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A chromophore is the part of a molecule responsible for its color. The word is derived from Ancient Greek χρῶμᾰ 'color' and -φόρος 'carrier of'. The color that is seen by our eyes is that of the light
Leaves change color in the fall because their chromophores (chlorophyll molecules) break down and stop absorbing red and blue light.