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Natural Pigments Green Vitriol (ferrous sulfate) 500 g - Color: Blue-green crystalline powder

SKU : NAP-500-22FES50
The minimum order amount for this product line is $30.00
Natural Pigments Green Vitriol (ferrous sulfate) 500 g - Color: Blue-green crystalline powder
Discount table
Qty Price
 1   US$ 10.50 
 2   US$ 10.44 
 3   US$ 10.40 
 4-5   US$ 10.37 
 6-7   US$ 10.34 
 8-11   US$ 10.31 
 12+   US$ 10.27 
Price: US$ 10.50
US$ 10.50

Product description

Ferrous Sulfate or iron(II) sulfate is most commonly encountered as the blue-green heptahydrate, known since ancient times as copperas or green vitriol. Ferrous sulfate can be found in various states of hydration, and several of these forms exist in nature. At 90° C., the heptahydrate form loses water to form the colorless monohydrate.

Ferrous sulfate was used in the manufacture of inks, most notably iron gall ink, which was used from the middle ages until the end of the 18th century. The ink was generally prepared by adding ferrous sulfate to a solution of gallotannic acid. The tannic acid was usually extracted from oak galls (also known as "oak apples" or more correctly "oak marble galls"), or galls of other trees; hence the name. Fermentation or hydrolysis of the extract releases gallic acid, which yields a darker black ink. The fermented extract is combined with the ferrous sulfate and a binder such as gum arabic.

Ferrous sulfate heptahydrate is generally the starting-point in the preparation of iron pigments. When pure, it forms fine sea-green crystals, with an astringent metallic taste, which are not poisonous and are easily soluble in water. After long exposure to the air, ferrous sulfate becomes covered with an ochre-colored crust, consisting of basic ferric sulfate. The ferrous oxide contained in the green vitriol has united with oxygen and been converted into ferric oxide. The latter requires a larger quantity of acid than ferrous oxide for the formation of soluble salts, so that an insoluble basic salt is separated. The same thing occurs when a solution of ferrous sulfate is exposed to the air. When green vitriol, or any other ferrous salt, is exposed to the action of oxidizing agents, such as chlorine or nitric acid, the iron is rapidly changed into the ferric state. This transformation is of particular importance in the manufacture of certain blue pigments.

It also finds use in dyeing as a mordant. Two different methods for the direct application of indigo dye were developed in England in the 18th century and remained in use well into the 19th century. One of these, known as china blue, involved iron(II) sulfate. After printing an insoluble form of indigo onto the fabric, the indigo was reduced to leuco-indigo in a sequence of baths of ferrous sulfate (with reoxidation to indigo in air between immersions). The china blue process could make sharp designs, but it could not produce the dark hues of other methods.

Typical Properties
Chemical Name: Iron(II) Sulfate Heptahydrate
Chemical Formula: FeSO4·7H2O
CAS No.: 7782-63-0
Mesh (%): 90% 100 mesh
Color: Blue-green crystalline powder

Keep in a tightly closed container, stored in a cool, dry, ventilated area. Protect against physical damage. Maintain a constant temperature not to exceed 24° C. (75° F.). Fluctuating temperatures causes product oxidation. Do not use this product if coated with brownish-yellow basic ferric sulfate. Isolate from incompatible substances. Containers of this material may be hazardous when empty since they retain product residues (dust, solids); observe all warnings and precautions listed for the product.

Safe Handling
Do not ingest. Do not breathe dust. Wear protective gloves and clean body-covering clothing. Use chemical safety goggles and/or a full face shield where splashing is possible. Refer to Material Safety Data Sheet.


Environmental Hazards
Short term and long term adverse effects to the environment are unknown. If product is spilled, comply with Federal, State and local regulations on reporting spills. Refer to Material Safety Sheet and labels for further details.

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.
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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.
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Green Vitriol (ferrous sulfate) 500 g
Green Vitriol (ferrous sulfate) 500 g

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