Umbers are one of the oldest pigments used by mankind. These natural Iron Oxides are known for their durability. They are both lightfast and chemical resistant. As such, they are considered permanent pigments. Raw Umbers are based on the naturally occurring Umber ore. Hoover 402RU balances the need of product quality and cost. This pigment disperses on a high-speed disperser to a lower level than Hoover’s Best grades, but can still be media-milled to the desired grind specification. By eliminating Hoover’s premium grinding step, Hoover can pass the cost savings on to our customers.
One of the characteristics that make Raw Umber such a useful pigment is that it is a “neutral toner.” Often brighter colored pigments are too bright (or have too much chroma) for a given application. Adding a black pigment to darken these colors adds an undesirable color component from the black. Raw Umbers maintain a neutral tone, reducing a brighter pigment’s chroma without affecting the hue. As a result, Raw Umbers are a major component in today’s Architectural Coatings coloring systems and other tinting systems.