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enter image description here What is the black stuff being applied in the last photo?

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    Black mortar/mortar with a black tint added. – Gunner Oct 22 '14 at 3:59
  • Gunners got it, it is just black mortar, not an adhesive. It is available in a range of colors at masonry supply stores, usually NOT at the big box stores... – Jack Oct 22 '14 at 5:48
  • Text in your posted image says it: "pointing mortar for bricks." – alt Oct 22 '14 at 15:34
  • @Gunner You should make that the answer. – John Oct 23 '14 at 7:28
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It is just black mortar. They sell mortar in many different colors along with powdered coloring you can add to make just about any color you want.

Mortar is used between brick and block to seal the joint from the elements, and to lock the bricks together (among other things). In the picture above, it is not used to lock the bricks together or weatherproof the joints but is used for aesthetics by giving the final product a nice contrast between the red brick and black mortar.

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