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5 Plastering Lime shall be high calcium and wood burned, low in impurities such as magnesia, alumina and silica, and devoid of such impurities as iron oxide and sulphur. Lime shall be slaked for a period of [[strikethrough]] of [[/strikethrough]] not less than 4 months for plastering done under these specifications. Note: Mr Shahn will furnish address of persons able to supply such lime. In the event that such lime is not available address of comp producing a suitable hydrate will be furnished, and said hydrate shall be reduced to a putty and allowed to stand at least [[strikethrough]] one [[/strikethrough]] 2 week ? before use. Marble dust used in the scratch coat shall be a mixture of grade #16 and #18 commonly known as "rough". Marble dust used in the 2 brown coats shall be grade #18