Black mortar

Black mortar

Mortar with the addition of ash, either because a black color is desired for pointing, or to reduce cost.

black ash mortar, black mortar

A mixture of high-calcium lime, water, and ashes or clinker which relies on its pozzolanic properties for its hard set.
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A shame, really, since the dark red brick building, laid in Flemish Bond using black mortar with black sand, was very prominent among the other, more neutral buildings on The Mall.