Extenders Set

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The Extenders Set contain sixteen different extender pigments in a boxed set that is an excellent introduction to making your own grounds and mediums, especially useful for exploring the function and behavior of different fillers in grounds.

The Extenders Set contain sixteen extender pigments in a boxed set that is an excellent introduction to making your own grounds and mediums and as a great gift for the art student. The set is especially useful for exploring the function and behavior of different fillers in painting mediums.

Sixteen natural minerals are included in this set to introduce you to extender pigments and their function in grounds and painting mediums. The set includes 4 vol oz. jars each of:

Set Contents
Italian Gesso

This dry ground natural gypsum (calcium sulfate) is made according to an old process near Siena, Italy. Gesso Oro per Indoratori is quarried and processed in Colle Val d'Elsa, the birth place of Cennino Cennini, in the same locale where he obtained his gesso for "gesso sottile." Gesso (Italian for gypsum) was used since before the Renaissance and mixed with animal collagen glue size to prepare wood panels and frames for painting and to adhere gold leaf.

Talc Our talc is dry ground from natural ores in Montana. Use as an additive to make grounds and for adding texture and body to paints.
Chalk (Calcite) The finest whiting for making brilliant white chalk grounds. Our whiting is dry ground from limestone deposits in the Lucerne Valley, California. Dry grinding limestone reduces it to a powder without destroying its particle structure, which is important in making strong chalk grounds and providing tooth on the surface of the grounds. The larger particle size of our chalk (when compared to precipitated chalk) keeps oil absorption low, which is ideal when adding it to oil paint and mediums. In painting grounds it makes a durable surface with tooth for egg and casein tempera, distemper, encaustic and oil paint.
Clear Glass Powder Clear glass powder made from leaded crystal glass and ground into fine powder can be used in all media to give colors added luminosity or to create textural effects on the surface of paintings. Fine: Finer than 63 μ
Aluminum Trihydrate (ATH) Aluminum trihydrate is a filler, extender and bodying agent in oil- and water-borne paint that does not greatly affect the color of the paint. This is an 8 micron median particle size extender that is a bright white powder.
Kaolinite, Calcined Kaolinite is a clay mineral, also known as China clay or kaolin. Calcined kaolin clay is used as a functional extender in paint. Kaolin clay is also used in grounds, such as for painting and gilding.
Perlite Perlite is a amorphous volcanic glass that is processed so that it is greatly expanded and white. It can be used in painting grounds and to increase the bulk and give texture to paint.
Mica (Wet Ground) Our muscovite mica is a wet ground mineral used for applications requiring greater resistance to moisture, heat, light or chemicals and to add decorative effects, such as pearlescence.
Terra Alba Terra alba is a natural gypsum that can be used as an extender in paint and filler in grounds. Terra alba, calcium sulfate dihydrate, is made by fine grinding and air separating a select, high purity, white gypsum from Italy containing about 20% water of crystallization.
Marble dust Medium, Fine and Extra Fine marble dust. Free-flowing, dry ground marble from natural calcite deposits with a controlled particle size. Use this marble powder to make grounds and for adding texture and body to paint.
Barite This is a highest quality white, natural barium sulfate ore. Its unique properties of fine grind (3 micron median particle size), high specific gravity (4.4) and chemical inertness make it ideal for grounds, to make white paint and as paint filler.
Silica This is a high purity, natural crystalline silica that comes from quartz quarries in Oklahoma. It is a fine ground silica sand that is inherently inert, white, bright, and is at least 99.2% silicon dioxide. Special processing assures a controlled particle size distribution, which eliminates excessively coarse and fine particles. These properties, combined with its inertness and low cost, make silica an excellent filler and extender for paint.
Nepheline Syenite Extra Fine Nepheline syenite is a micronized functional filler and extender used as a performance enhancer in a broad range of paints, coatings, adhesives, sealants, and inks. Excellent brightness, tint retention, and weatherability can be achieved in paints. Improved color, sheen uniformity, chemical and stain resistance, and durability result when it is used in interior paint formulations. It is easily dispersed in all conventional vehicle systems, and low oil absorption permits high loadings in adhesives, sealants, and aqueous and alkyd-based paints.
Wollastonite Extra Fine Wollastonite is a calcium metasilicate mineral that exhibits lower viscosity in paint than is indicated by its oil absorption value. The low oil absorption characteristic of wollastonite enables you to reduce raw material cost by replacement of the vehicle. The relatively high pH (10–11) of wollastonite is particularly useful in maintaining the desired alkaline pH level of water-based paints and preventing early rusting of water-based coatings. Wollastonite is an excellent extender pigment for powder coatings as well as solvent-based and waterborne paints.
More Information
BrandRublev Colours
VendorRublev Colours
Processing TimeUsually ships the next business day.

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Extenders Set
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