Building Materials
The cast iron when heated to red heat with powdered red haematite in an oven for increasing its toughness, is converted to

Grey cast iron
Mottled cast iron
White cast iron
Toughed cast iron

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Building Materials
Priming consists of

8 parts of white lead, one part of chalk and four parts of twice boiled linseed oil
One part of white lead, 8 parts of chalk and one part of linseed oil
None to these
One part of white lead, 8 parts of chalk and four parts of twice boiled linseed oil

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