Chalk (Calcite), Size: 5 Kg Bag, Grade: Extra Fine

SKU: NAP-510-11CHX5K
Unit Price
US$ 31.38
US$ 31.38
US$ 31.191%
US$ 31.081%
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Processing time
Usually ships the next business day.

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.

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

Dry ground limestone with a closely-controlled particle size distribution.
Source Lucerne Valley, California
Chemical Name Calcium Carbonate
Chemical Formula CaCO3
CAS No. 13397-26-7
Typical Physical Properties Fine Extra-Fine
Median Particle Size 13.0 microns 3.5 microns
Dry Brightness (Hunter Y, Rd Value) 95 96
Retained on 325 Mesh Screen 0.001% 0.1%
Oil Absorption 8.5 g oil / 100 g pigment 10.5 g oil / 100 g pigment
Loose Bulk Density 0.69 g/cc (43 lbs./ft3) 0.46 g/cc (29 lbs./ft3)
Packed Bulk Density 1.63 g/cc (102 lbs./ft3) 1.14 g/cc (71 lbs./ft3)
Specific Gravity 2.7 2.7
Mohs Hardness 2–3 2–3
Typical Chemical Analysis
Calcium Carbonate (CaCO3) 98.5%
Magnesium Carbonate (MCO3) 1.0%
Iron Oxide (Fe2O3)
Moisture Loss @110° C.
Shipping specs
11 lbs
Shipping from
This product is shipped from our supplier's warehouse in Willits, CA, United States
Our guarantee
This product is brand new and includes the manufacturer's warranty, so you can buy with confidence.
A 25% handling charge is levied against all authorized returns except those due to our error. Unauthorized returns are subject to a 40% handling charge. Damages & defects must be reported to us within 14 days.
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