How to Change Color Mortars

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Things You'll Need

  • Goggles

  • Gloves

  • Muriatic acid

  • Small paintbrush

  • Damp cloth

  • Chisel

  • Hammer

  • Mortar

  • Large bucket

  • Mortar pigment

  • Trowel

Change the mortar of interior brick to match your paint and furniture choices.
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Mortar is the glue that binds bricks together, making them one of the sturdiest and most water-resistant construction materials used today. Mortar comes in a wide variety of types depending on where it will be used and is available in many colors to suit your design needs. If you have a fireplace, stone wall or other bricked area with mortar that is not to your liking, there are two basic ways you can change the color of the mortar: applying a muriatic acid to the surface of the brick or re-applying new mortar.


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Muriatic Acid

Step 1

Apply a 10 percent solution of muriatic acid to the mortar with a small paintbrush.

Step 2

Allow the acid to remain on the mortar for about five minutes or until the acid has stopped fizzing.


Step 3

Rinse the area and allow it to dry to see the color change. Muriatic acid will lighten up the mortar slightly. If the area is not lightened up enough, wait a few days and apply a second coat of acid.

Apply New Mortar

Step 1

Use a chisel and hammer to remove ΒΌ-inch of the existing mortar from between the bricks.


Step 2

Mix up some mortar in a large bucket by following the directions on the package. Once the mortar has been mixed, add a powdered pigment into the bucket to tint the mortar the desired color. Test a few samples of the mixture on a mortar board to determine if the mortar is the desired color before you apply it to your brick.


Step 3

Apply the mortar to the gaps between the bricks with a trowel. Scrape off any excess mortar with the trowel and allow the surface to dry thoroughly. Your mortar should now be a different color to match your design needs.