Hoover 406RU Raw Umber

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Hoover 406RU Raw Umber

Product OverviewTypical PropertiesColor Display

Umbers are one of the oldest pigments used by mankind, based on the naturally occurring Umber ore. These natural Iron-Oxides are known for their durability, being both lightfast and chemically resistant. As such, they are considered permanent pigments. Raw Umbers such as Hoover Color’s 406RU are processed to a lower extent than Hoover Color’s Best and Better series of Raw Umbers, and that cost savings is passed on to our customers. This translates to a lower Hegman value with high speed equipment.

One of the characteristics that make Raw Umbers 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 add 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 as well.

Properties Description
Appearance Brown Powder
Chemical Composition Goethite
Pigment Index Brown 7
Color Index 77491
CAS No. 12713-03-0



* Tint Tone: reduction with TiO2 1:4.
**The color shades presented here are as accurate as monitor settings allow.**
**They may be different from shades in actual application and are for reference only.**


Coating, Leather Coatings, Paints & Colorants, Artist materials, Wood Stains, Others