Shipping & Delivery  |  Safe & Secure Shopping  |  About Us  |  Contact Us Place order online or call   1-800-929-2431
Home page
   
0
Product search
Up

ArtistSupplySource.com » Painting & Painting Accessories » » » Natural Pigments Cobalt Zinc Blue 50 g - Color: Blue
 

Natural Pigments Cobalt Zinc Blue 50 g - Color: Blue

SKU: NAP-417-1005
The minimum order amount for this product line is $30.00
Natural Pigments Cobalt Zinc Blue 50 g - Color: Blue
Discount table
Qty Price
 1   US$ 23.69 
 2   US$ 23.55 
 3   US$ 23.46 
 4-5   US$ 23.41 
 6-7   US$ 23.32 
 8-11   US$ 23.26 
 12+   US$ 23.18 
 
Price: US$ 23.69
Quantity:
 
 
 
Subtotal:
US$ 23.69


SSL seal



Product description

Details
Net Wt 50 g

Water-Based Paint
In most water-based paint, cobalt blue is a semi-transparent pigment with moderate tinting strength. When it dries, it appears lighter and less saturated. Although pigment particles are very fine, they flocculate, giving a grainy appearance in watercolor. Differences in how the pigment is ground and mixed lead to considerable differences in its performance.

Oil-Based Paint
In oil-based paint, cobalt blue is a semi-transparent pigment with moderate tinting strength. Differences in how the pigment is ground and mixed can lead to considerable differences in its appaearance.

Color Names
Current Names: English: cobalt blue
French: bleu , bleu de
German: Blau
Italian: azzurro di
Spanish: azul de


Origin and History
Since ancient times, smalt blue has been used to color glass and ceramics. Cobalt salts, which give smalt its characteristic blue color, were identified in the 18th century. Techniques for manufacturing cobalt blue, a chemically pure salt of cobalt and aluminum oxide, were developed in 1802.

Source
Cobalt blue is cobalt aluminate blue spinel (Pigment Blue 28 or PB 28) with the chemical structure CoAl2O4 of which there are three basic modifications (Pigment Blue 36:1, Pigment Blue 36 and Pigment Blue 72), in which parts of the cobalt are substituted either alone or in combination with chromium and zinc. These variations differ in their tinting strength and hue.

Color Formula Color Index
Cobalt aluminate blue spinel CoAl2O4 Pigment Blue 28
Cobalt chromite blue-green spinel Co(Al,Cr)2O4 Pigment Blue 36
Zinc cobalt chrome aluminum spinel (Zn,Co)(Cr,Al)2O4 Pigment Blue 36:1
Cobalt zinc aluminate spinel (Co,Zn)Al2O4 Pigment Blue 72


The basic cobalt blue color, Pigment Blue 28, is produced by high-temperature calcination of cobalt (II) oxide (CoO) and aluminum oxide (Al2O4). The variations are produced by a partial substitution of the cobalt by chromium and zinc, either alone or in combination with each other. The result is a large variety of cobalt blue pigments that differ in their tinting strength or hues (reddish or greenish blue), depending on the exact chemical composition. The lighter-colored cobalt blue is prepared by addition of zinc (II) oxide to the ingredients used for the basic pigment, forming Pigment Blue 72. Blue-green hues are produced by introducing chromium (III) oxide, partially replacing the aluminum (III) oxide in the basic cobalt blue, forming Pigment Blue 36.

All of them form the crystalline modification of spinel during calcination. The spinels are a class of minerals that crystallise in the cubic (isometric) crystal system with the oxide anions arranged in a cubic close-packed lattice and the cations occupy some or all of the octahedral and tetrahedral sites in the lattice. Spinel minerals form octahedral crystals that are usually twinned. They have an imperfect octahedral cleavage and conchoidal fracture. The hardness of spinel minerals is around 8 (chalk has a hardness of 2-3), specific gravity is 3.5-4.1 and it is transparent to opaque with a vitreous to dull luster.

Permanence
All cobalt blue pigments are chemically inert, absolutely insoluble, have good hiding power and excellent heat stability, and show very good lightfastness and weather resistance.

Oil Absorption and Grinding
Cobalt blue absorbs a moderately high amount of oil; about 55 grams of linseed oil per 100 grams of pigment to make a paste. It has been noted in some mannuals that the pigment works better as a watercolor than it does in oil, and is highly valued on that account among moist colors used by artists. Grinding it for artists' use in oil will require 35 percent dry pigment to 65 percent by weight of poppyseed or walnut oil, either of which is preferred by some artists to linseed oil. Cobalt blue has a greenish tone that when viewed under incandescent light is more or less reddish blue.

Toxicity
Cobalt blue is not considered toxic, however, care should be used in handling the dry powder pigment to avoid inhaling the dust. All toxicological studies showed no signs of toxicity to humans or the environment.

In animal studies, cobalt blue pigments did not display acute toxicity. No acute irritant effect was shown in tests to determine the acute irritation of skin and mucous membranes. In studies on rats to determine the carcinogenic potential, no statistically significant results were found. Soluble cobalt compounds as well as cobalt metal may have a sensitizing effect. However, none have been reported during the experience of many years of handling cobalt blue pigments.

Ecology
Since cobalt blue is inert and practically insoluble in water, it does not pose a hazard to the environment. The pigment can be removed mechanically from effluents. On controlled dumpsites, no dissolved heavy metals are released into the seepage water.


Rublev Colours Pigment: Cobalt Blue

Pigment Information
Color: Blue
Colour Index: Pigment Blue 72 (77347)
Chemical Name: Cobalt Zinc Aluminate (Spinel)
Chemical Formula: (Co,Zn)2Al2O4
CAS: 68186-87-8
ASTM Lightfastness Rating
Acrylic: I
Oil: I
Watercolor: I
Properties
Specific Gravity: 1.7
Refractive Index: 1.56-1.662
Oil Absorption: 55 g oil/100 g pigment






Specifications:

Color: Blue
Color Index: Pigment Blue 72 (77347)
Chemical Name: Cobalt Zinc Aluminate (Spinel)
CAS Number: 68186-87-8
Acrylic: I
Oil: I
Watercolor: I
Refractive Index: 1.56-1.662
Oil Absorption: 55 g oil/100 g pigment



Natural Pigments

Natural Pigments is a limited liability company based in Willits, California. We manufacture and distribute rare and hard-to-find materials for fine artists and decorators. We specialize in supplying artists' materials that were used in historical painting since pre-historic times up to and including the nineteenth century.

We constantly search for materials and products of the finest quality so that we can bring them direct to you from the source. To do so, we travel the world to find materials specifically for use by professional artists and decorators. We obtain minerals from mines in Afghanistan, Chile, Russia, Ukraine and Uzbekistan, to name a few places, processing these into natural pigments. We purchase resins, gums and plants from India, Kenya and Malaysia to make natural varnishes and painting mediums.

Our mission is to provide the largest variety of natural pigments, paints and other professional artists' supplies, enabling us to bring you a selection that makes shopping for rare and hard-to-find art materials easy. Our objective is to promote the education and use of these materials among artists by providing detailed information for their employment in encaustic, fresco, oil, watercolor and tempera painting.
All Natural Pigments products


Product weight: 0.11 lbs
 

This product is shipped from our warehouse in Gretna, NE, USA.
This product is brand new and includes the manufacturer's warranty, so you can buy with confidence.
Please submit your product question using this form. All fields are required.

Your First name: *
Your email: *
Your phone: *
Product question:
Please don't mention your email and your phone in this field.
*
Submit question

Detailed images
Cobalt Zinc Blue 50 g




Brands:  0-9  A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z All Natural Pigments products

Web Orders
24 hours a day, 7 days a week

Email Support
Contact Us

Telephone Customer Service
Mon-Fri: 9 a.m. to 5 p.m. EST
Toll Free: 1-800-929-2431
Tel: (616) 259-5711
Fax: (813) 944-4516



USA Address
S3 Stores, Inc.
2885 Sanford Ave SW #12717
Grandville, MI 49418
USA

Canadian Address
S3 Stores, Inc.
27 Joseph St.
Chatham, Ontario N7L 3G4
Canada

Payment Methods
We accept all major credit cards
Purchase Orders
Combating eCommerce Fraud
Copyright © 2005-2016 S3 Stores Holdings, Inc. All Rights Reserved.   Terms of Use | Privacy Policy