WitrynaOrganic compounds tend to be colored when there is extensive conjugation, causing the energy gap between the HOMO and LUMO to decrease, bringing the absorption band from the UV to the visible region. Similarly, color is due to the energy absorbed by the compound, when an electron transitions from the HOMO to the LUMO. WitrynaThere are three main components of soil color: (1) hue is the soil's resemblance to red or yellow, (2) value describes the relative darkness and lightness of the soil, and (3) chroma is how weak or strong a color appears. A weak chroma can be a grayish orange soil, whereas a strong chroma can be a pronounced bright orange.
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