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Marble Dust (Fine) 5kg

SKU: NAP-510-10GS2555K
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The finest marble dust for making brilliant white grounds. Our whiting is dry ground from marble deposits in the United States. Dry grinding reduces it to a powder without destroying its particle structure, which is important in making strong grounds and providing tooth on the surface of the grounds. The low surface area of our marble (when compared to precipitated chalk) keeps oil absorption low, which is ideal when adding it to paint and painting mediums. In painting grounds it makes a durable surface with tooth for egg and casein tempera, distemper, encaustic, oil paint, and watercolors.

Both limestone and marble are calcium carbonate (CaCO3), which is also the composition of the mineral calcite. Marble is a metamorphic rock composed of recrystallized calcite. The metamorphism of limestone causes the calcite grains to grow in size and to interlock with one another. The result is that marble is noticeably more dense and harder than limestone. Limestone forms under deep marine conditions from the gradual accumulation of minute calcite plates (coccoliths) shed from micro-organisms called coccolithophores and hence contains invertebrate fossils. However, these fossils are almost always destroyed by the metamorphic changes that convert limestone to marble.

Add to paint and mediums to create textural and bodying qualities to paint without affecting the color. Marble dust has little color in drying oils, so it can be added to oil paint without affecting the tint of the color.

Properties
Extender Pigment Marble, Fine Marble, Medium
Description A fine particle size marble with a closely-controlled particle size distribution. A medium particle size marble featuring a careful control of oversized particles.
Source Marble Hill, Georgia Sahuarita, Arizona
Chemical Analysis
Calcium Carbonate 95% 95%
Typical Physical Properties
Mean Particle Size 11 microns 20 microns
Hegman Fineness 3
Brightness (Hunter Y) 92 88
Retained on 325 Mesh Screen 0.03% 12%
Moisture 0.12% 0.15%
Acid Insolubles 2% 3%
Oil Absorption 9 g oil / 100 g pigment
Solid Density (lbs.gal) 22.7 22.7
Bulk Density, Packed 80 lbs./ft3 95 lbs./ft3
Bulk Density, Loose 55 lbs./ft3 65 lbs./ft3
Specific Gravity 2.7 2.7
Refractive Index, mean 1.6 1.6
Mohs Hardness 3 3


Shipping specs
Weight
12.00 Lbs
Dimensions
0" x 0" x 0"
Shipping from
This product is shipped from our warehouse in Willits, CA, USA.
Our guarantee
This product is brand new and includes the manufacturer's warranty, so you can buy with confidence.
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