Color is often helpful in distinguishing between soil types, and with experience, one may find it useful in identifying the particular soil type. Color may also indicate the presence of certain chemicals.
Color often varies with moisture content of a soil.
For this reason, the moisture content at the time of color identification should be included. Some of the more familiar color properties are listed below. . Generally, colors become darker as the moisture content increases and lighter as the soil dries. . In contrast, clean, bright looking shades of gray, olive green, brown, red, yellow, and white are associated with inorganic soils. . Red, yellow, and yellowish brown result from the presence of iron oxides. .