The word “grout” is often used in the context of ceramic tile installation. What you have around the stone in your fireplace is probably mortar. In the case of grout, it is used to seal joints between tiles mortar is used to join stones together. Apart from providing an unbreakable connection between the stone, it also enhances the look and feels of bricks or stones. In any case, it is possible to alter the color of mortar by a variety of methods. If the mortar is a little too dark and you wish to lighten it by a little, then begin by using 10% that contains muriatic acid. Apply the solution on the mortar joints using the bristle of a small brush or similar equipment. A small amount or a little of this acidic brick or stone will not cause any harm provided you don’t let it stay for a long time.

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Let the acid stay on your mortar joint for at most 5 minutes, or till it stops bubbling. Rinse the area completely before allowing it to dry. It may be necessary to wait until the mortar is dry completely before determining whether the method was successful. If the mortar has become lighter but the desired outcome isn’t attained, give the mortar another acid treatment, and let it dry in order to test the outcomes.

Safety first. Wear protective eyewear and rubber gloves and ensure there is enough ventilation within the work area while working with acids.

Another way to alter the color of mortar is to scrape off 1/4 inch off the exterior of the mortar by using a hammer or chisel and then apply a new layer of mortar on top. The powdered pigment can be added to the new mortar in order to create the color that best suits your decor needs. First, you should make some test samples of mortar on a board to be sure you’ve got the desired color. Make sure you let the mortar sample fully dry as mortar generally be lit when it dries.

This black piece of metal you’re talking about is the front side of the prefabricated fireplace, which was put in place prior to that stones were laid. We understand your frustration with the design of this metal trim however, we recommend you don’t modify it. The trim is often adorned with air exchange or intake vents that could be affected by being the trim is enclosed by tiles or stone. We believe the most secure solution to this issue would be to consider applying spray paint that is heat resistant that is similar in color to your stone or the color of your new mortar.