Chalk, Marble Dust, Pumice and Fillers


Calcium Carbonate is the generic name for a variety of different minerals found all over the world. It's found in the shells of marine animals and is an active component in agricultural lime. It's a component of lime stone, marble, chalk, gypsum and precipitated chalk. Calcium carbonate ores can be found in two of the three major types of rocks: sedimentary and metamorphic. Sedimentary rocks form from sediment or from transported fragments deposited in water. Limestone, for example, is formed from inorganic remains, such as shells and skeletons. Metamorphic rocks such as marble, slate, quartzite form when a rock mass is subjected to great heat and pressure. The ore may contain other elements like magnesium, iron and manganese that affect whiteness, hardness and specific gravity.

So what does all mean? Well, depending on your application and the end result you are searching for, one of the calcium carbonates or any of them will suit your needs.

French Chalk (otherwise known as french whiting) is used in creating a traditional gesso made with rabbit skin glue. It is also used in gilding where it's inherent softness is needed when burnishing gold leaf. It is also used as a filler/extender for oil paints and for making softer pastel sticks.

Marble Dust is also used in making gesso though it tends to be a harder and whiter gesso. Acrylic gesso uses marble dust as one of the primary components. It is used as an ingredient in Venetian and Marmorino plaster. It to can be used as a filler for paints. Coarser kinds can be used in fresco in place of sand.

Talc is nothing like calcium carbonate. It's primary function is as a filler and lubricant. It is used widely in industrial applications for a seemingly endless array of possibilities
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