Raw salt can have a color due to impurities and minerals present in the salt before it is refined. The color can range from white to various shades of pink, brown, or even black. The primary reason for the color is the presence of trace elements and minerals such as iron, magnesium, calcium, and potassium. These elements can give the salt a distinct hue. For instance, iron can cause the salt to appear pink or red, while magnesium can lead to a brownish tint. Additionally, the color can also be influenced by the source of the salt, as different regions have varying mineral compositions in their underground salt deposits.

The color of raw salt is a result of the natural geological processes that occur during the formation of salt deposits. Over millions of years, water containing dissolved minerals evaporates, leaving behind the minerals that eventually crystallize to form salt. The specific minerals present in the salt depend on the geological history of the area where the salt was formed. For example, salt from the Dead Sea is known for its pink color, which is attributed to the high concentration of minerals like magnesium and calcium.

Data from various studies support the presence of these minerals in raw salt. A study published in the Journal of Analytical Atomic Spectrometry analyzed the mineral composition of different types of salt and found that raw salt contains a variety of trace elements. Another study, published in the Journal of Food Science, examined the color of salt and found that the presence of iron and magnesium significantly contributed to the coloration of the salt.

In conclusion, the color of raw salt is a natural phenomenon resulting from the presence of impurities and minerals. The specific color depends on the geological history of the salt deposit and the trace elements present.