*5.2.6.2 Precipitated black iron oxide*

**Properties:**

**Properties:**

*5.2.4 Green pigments*

**Properties:**

distempers. **Properties:**

metal.

**144**

*5.2.6 Black pigments*

**Properties:**

*5.2.6.1 Natural black oxide*

*5.2.4.1 Chrome green (Cr2O3)*

• Excellent covering power

• Has a dark brilliant colour

• High covering power and tinting strength

It is generally used as green pigments.

*5.2.5 Chromium oxide or guignet's green [Cr2O(OH)4]*

• High power of oil absorption.

• Have high covering power

• High corrosion inhibition capacity

erties and applications of these can be summarised as follows:

• It has disadvantages such as lack of brilliancy and opacity

It is used as paint for metal surface and as non-fading green for washable

They have good tinting strength and as well as high hiding power. The compo-

The composition of Fe2O3 is 94–95%. It is used in making paints for priming

• Oil absorption power is 10–15 kg of linseed oil per 100 kg of Pigment

sition, properties and applications of these can be summarised as follows:

• Inhibits corrosion

*5.2.3.2 Synthetic iron (Fe3O4)*

• Bright-red powder with a high specific gravity

*Dyes and Pigments - Novel Applications and Waste Treatment*

It is widely used in domestic paints, enamels, floors and paints.

There are two types of commonly used green pigments. The composition, prop-

It is used in cement emulsions and water paints. It has a high hiding power.
