Building Materials
Sapwood consists of

Thin fibre which extends from the pith outwards and holds the annular rings together
Portion of timber between heartwood and cambium layer
Thin layers below the bark
Innermost annular rings around the pith

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Building Materials
Putty is

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

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