The Manufacture of Earth Colours

Cover The Manufacture of Earth Colours
The Manufacture of Earth Colours
Josef Bersch
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The solution will always be cloudy, owing to the partial precipitation of the hydroxide by the lime in the water ; but this is immaterial. For the precipita- tion, a milk of lime is prepared by slaking one to two parts of quicklime (according to the quantity of ferrous sulphate to be treated) in water, and stirring this up in enough water to make a thin milk. Care must be taken to exclude any large particles of lime, since these would find their way into the finished product and make the colour
... uneven. On this account, the milk of lime should be carefully strained through a loosely woven cloth or fine sieve, into the precipitation vessel.
The ferrous sulphate solution is then poured in, the mixture being kept stirred, and an ugly, grey-green precipitate is . Produced, consisting of a mixture of ferrous hydroxide and calcium sulphate, the reaction being explained by the equation : FeSO 4 + Ca(OH) 2 = Fe(OH) 2 + CaS0 4 .
The larger the amount of ferrous sulphate solution added to the milk of lime, the darker the resulting ochre.


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