Building Materials
The basic purpose of a retarder in concrete is

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

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Building Materials
Priming consists of

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

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Building Materials
Putty is

Used for fixing glass panes
All listed here
Softened by a solution of pearl ash and quick-lime soaked in water
Made with finely powdered chalk and linseed oil

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