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Mortar is used between bricks, cinder blocks, or stone to bind them and fill any gaps. It is made from sand, a binding agent (cement or lime), and water.

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Will colouring mortar weaken it?

The old mortar was red and the new mortar is grey (uncoloured). So it looks a little silly with both colours present. … Surely the strength of the mortar is down to the ratio & quality of the mix, isn't it? (The mortar at the front of the house is red, the replaced mortar at the side is not) …
Lee Kowalkowski's user avatar