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Smalt

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1. Overview 2. History

of use

3.Making thepigment

4. Technicaldetails

How Smalt is made:

Artificial variety of

pigment

Heating of quartz, potassium carbonate and small amount of cobalt(II)-chloride to 1150°C and inserting the still hot product into cold water. The disintegrated glass is then homogenized in a mortar.

Illustration of the process:

Making smalt at Kremer Pigments

Making smalt in the student laboratory

Heating the mixture of sand, potassium

carbonate and cobalt oxide

While in the oven, the color changes from red

to blue

The blue colored finished product prior to grinding

The mixture of sand, potassium carbonate

The mixture is transfered into a After 30 minutes at ca.

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and cobalt (II,III) oxide is homogenized

preheated oven 1100°C

The still hot glassy product is being

pulverised by immersion into cold water

Filtration of the finished product

The ground pigment:

Pile of ground Smalt:

Other blues ( ) - - - - -

- - intro Azurite Cerulean Blue cobalt blue Egyptian blue Indigo

Prussian blue smalt Ultramarine

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