Building Materials
Priming consists of

One part of white lead, 8 parts 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
8 parts of white lead, one part of chalk and four parts of twice boiled linseed oil

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Building Materials
The basic purpose of a retarder in concrete is

To increase the initial setting time of cement paste in concrete
To render the concrete more water tight
To improve the workability of concrete mix
To decrease the initial setting time of cement paste in concrete

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