Transparent Yellow Iron Oxide is warm brown color in masstone that makes clean bright yellow tints in glazes. This color can serve as an alternative to Stil de Grain or Dutch Pink in other paint brands.

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Composition and Permanence

Transparent Yellow Iron Oxide

Color:YellowBinder:Linseed oilAdditive(s):NonePigment InformationPigment:Synthetic Hydrated Iron OxidePigment Classification:Synthetic inorganicColour Index:Pigment Yellow 42 ()Chemical Name:Ferric hydroxide oxide, Iron(III) oxideChemical Formula:Fe(OH)OCAS No.-49-4

Properties

Code:371Series:4Opacity:TransparentTinting Strength:HighDrying Rate:MediumASTM Lightfastness:I - ExcellentPermanence:Granularity:Very FineSafety Information:Based on toxicological review, there are no acute or known chronic health hazards with the anticipated use of this product. Always protect yourself against potentially unknown chronic hazards of this and other chemical products by avoiding ingestion, excessive skin contact, and inhalation of spraying mists, sanding dusts, and concentrated vapors. Contact us for further information or consult the MSDS for more information.

 

For a detailed explanation of the terms in the table above, please visit Composition and Permanence.

Notes

Some separation of pigment and oil may occur in Rublev Colours Artist Oils and is a natural process when no wax or stabilizers are added to paint to prevent this from occurring.

All images of color swatches in this web site are only approximations of the actual color of the oil paint. We have taken every care to match the color in these pictures on calibrated color monitors to the actual color. However, because of the wide variance in color monitors the results you get may vary.

Color Swatch Note: The color swatch was created with a thick application (left side) of color and a tint (right side) made with equal parts of color and titanium white and applied on acrylic primed cotton canvas.

Drawdown Note: The image of the "drawdown" contains a pre-mixed paint film of 6 mil (0.006 inch) thickness applied to a standard test card for the purposes of examining color consistency, opacity and other qualities. The drawdowns show the color full strength (mass tone), on the left, and mixed in a 1:2 ratio with titanium white on the right. The bottom area of the drawdowns are scraped to show undertones.

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Contact us to discuss your requirements of yellow iron oxide pigment. Our experienced sales team can help you identify the options that best suit your needs.

Iron Oxide Yellow

Alternate Names: Iron(III) oxide, hydrated iron oxide, iron(III) hydroxide, yellow iron oxide

Description: FeO(OH).H2O, Fe(OH)3, Goethite

Notes

This is one of the many raw colors of iron oxide powder. It is an iron hydroxide. Yellow ochre clay contains yellow iron oxide. In ceramics, red iron oxide is most commonly used in glazes and clay bodies, but black is also used. Yellow is the least color-stable form. Yellow iron oxide is a synthetic material of very fine particle size (but not as fine as black or red). All forms of iron normally produce red coloration when fired in clay bodies in oxidation.

Actual yellow iron oxides are around 85% Fe2O3 and about 12% LOI with some impurities (e.g. SiO2, CaO).

Theoretically, any form of iron could be used to source Fe in the fired ceramic product (of course they lose different amounts of volatiles on firing so they cannot be substituted gram-for-gram). However, in practice, this is not the case. Yellow iron, in our tests, for example, does not stain a glaze but it does stain a clay body. The reason is not apparent.

Yellow iron is not as fluffy and light as black, but more than red. It does not agglomerate as badly as red, but more than black. It is coarser in particle size and can leave some lighter colored residue on a 325 mesh screen (up to 8% in one specimen we tested whereas the others left zero).

Like other forms of iron, this is never used pure, it is always part of a recipe (a glaze, engobe or body).

Yellow iron is also used in paints, enamels, concrete colorants, plastics, rubber, and paper where permanent yellow is required. It has excellent hiding power, absorbs ultraviolet light, is compatible with a broad range of vehicles, disperses well in aqueous and solvent systems, and does not contain heavy metals.

One process of manufacture involves precipitation of ferric oxyhydroxide followed by purification through washing, drying and milling.

Related Information

Yellow Iron Oxide original container

Iron oxide powder is available in many colors. Here are three.

How can there be so many colors? Because iron and oxygen can combine in many ways. In ceramics we know Fe2O3 as red iron and Fe3O4 as black iron (the latter being the more concentrated form). But would you believe there are 6 others (one is Fe13O19!). And four phases of Fe2O3. Plus more iron hydroxides (yellow iron is Fe(OH)3).

Yellow, black and red Iron oxide in a buff burning body at cone 6 oxidation

Plainsman M340 buff cone 6 stoneware. 3% iron was added has been added to each of these. The yellow iron (left) is clearly not as concentrated (and not mixed in as well). The black (center) gives a maroon color.

Yellow iron oxide vs. Yellow Ochre - fired at cone 6

The rear two samples are just dried. The fired iron oxide (front left) is clearly exhibiting a metallic sheen and has shrunk and become much more dense. And heavy. In the raw state, both exhibit a measure of plasticity when water is added. The yellow iron really holds on to the water, drying out much more slowly. The iron oxide densifies and shrinks even more by cone 8, taking on the characteristics of the metal.

Matching the color of a natural clay using and iron oxide mix

The freshly thrown piece on the left front is a medium-temperature plastic stoneware body. Its color comes from a natural iron-bearing clay in the recipe. However, that red clay is becoming much more expensive and difficult to obtain because of trucking availability and cross-border issues. We are investigating the addition of iron oxide to a blend of buff burning materials (which can be tuned to match the working and firing properties of the original body). A 3% iron oxide addition is producing the same fired color. But raw color also needs to be matched. The answer is a blend of red:yellow:black iron oxides. The 3% iron addition in the rear centre piece is a 50:50 mix of red and yellow iron oxides, clearly it is too red. The right front piece is a 40:50:10 mix of red:yellow:black iron oxides. This is getting closer, for the next trial we will try more black and less red.

If you are looking for more details, kindly visit black iron oxide pigment.

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