Kat Hammer Mosaic Sunflowers light vs dark grout

Grout Color and Variegated Mosaic Backgrounds

I have examples throughout this blog illustrating why darker grouts work much better for mosaic artwork than light colored grouts do. I also have examples of using complex color fields of related hues and explanations why they provide more visual interest than monochromatic color fields.

I repeat these two points so often because they are easy ways to make your mosaics look much better.

Artist Kat Hammer recently started making mosaics, and her first two mosaics of sunflowers are great examples of both points. Actually, her second mosaic of sunflowers is a great teaching example of when NOT to use a complex color field for the background and when a simple monochromatic background is preferred.

That last detail is very important, and I haven’t talked enough about it.

First I need to point out how darn good a darker grout looks:

Kat Hammer Mosaic Sunflowers dark grout
Kat Hammer Mosaic Sunflowers dark grout

Why Dark Grouts?

The featured image for this article with the two versions of the same mosaic side by side makes the point better than words can.

Experienced artists use dark grout colors because light grouts make tile colors look washed out and less intense.

White grout is only used for bathroom tiling and summer camp projects -not mosaic art. I don’t think I have ever seen a mosaic that used white grout that looked good and certainly not as good as it would with another color. White grout is like wide grout gaps: both are great ways to sabotage your mosaic.

Tip: to minimize the color impact of grouting, keep your grout gaps small.

Kat Hammer Mosaic Sunflowers light grout
Kat Hammer Mosaic Sunflowers light grout

Changing Grout Color

Dry indoor mosaics can be “stained” with acrylic paint in a wipe-on/wipe-off process that leaves paint stuck to the rough grout but wiped clean from the smooth glass tile.

That was how Kat rescued her mosaic. She used a perfect tint of umber instead of absolute black, which would have been too severe in contrast I think.

Variegated Colors

Kat Hammer First Mosaic Sunflowers variegated background
Kat Hammer’s first mosaic Sunflowers with variegated background.

Kat’s first mosaic (shown above) is also a still life of sunflowers. Notice how all the elements (flower petals, stems/leaves, background) are made from multiple related hues instead of being monochromatic. Notice how this creates a lot of visual interest and sophistication in what is a relatively simple composition.

The background is wonderful in it’s own right. There is tons of visual interest in the background to attract the eye and lead it down beautiful paths of abstraction where the representative image is lost.

BUT thankfully those blue hues are cool, and the figure is warm and centered, and so the background still works in creating a sense of being “behind” the flower.

TIP: Keep your compositions relatively simple if you want to experiment in this way and push the envelope as far as having backgrounds as visually complex as the foreground without losing a sense of depth.

When NOT To Variegate

Variegation of color fields is such an easy way to make artwork look better that it can be tempting to use it by default.

While it is good to think in terms of variegation instead monochromatic elements, there are times when it can make elements less distinct from each other or the background and less defined.

This is particularly true of backgrounds when the elements in the foreground are “filigree” so that the background only appears in a few places.

If Kat had used a coarsely variegated background for her second mosaic the same as she did for her first one, it would not have the same sense of depth and foreground elements would not be as discernable from background.

In the second mosaic, the foreground elements are too complex and occupy too much area for a variegated background to “fade to the back visually.” It needs to be simple and monochromatic to do that.







9 responses to “Grout Color and Variegated Mosaic Backgrounds”

  1. Sheree Avatar

    Love this blog!! I’ve seen mosaics with pinks or green grout with a huge impact and was wondering how that was achieved. I’ve always used black but for some pieces would like to try. Thank you!

  2. Elizabeth Nanney Avatar
    Elizabeth Nanney

    I do mosaic scenes on tiles. Do you have any suggestions for finishing the edges of the pieces?

    1. Natalija Moss Avatar
      Natalija Moss

      A few articles on the blog deal with framing mosaic art. Search for “frame” in the search bar at the top. We’ve got an article on wood frames and on the store website there’s a tutorial I wrote on making aluminum frames if you want to get fancy.

  3. Pauline Avatar

    The darker grout makes the mosaic so much more real and deep! I am re-thinking all my mosaics now! THANK YOU!

  4. Jill Gatwood Avatar

    I almost always use charcoal (almost black) grout on my mosaic pieces and encourage my students to also, *most* of the time. However there are times when a mosaic has lots of detailed dark areas and a matching dark grout will obscure those details. I generally do find that grey grout can wash out colors, but white grout does not. White makes colors pop just like black does. One has to be very careful with white grout because it accentuates a fractured, rather than cohesive look to mosaic. Narrow groutlines with white is a must. But I have found white to be effective and very beautiful in some mosaics. I will send some examples to Joe and maybe he can post and critique them.

    1. Joe Moorman Avatar
      Joe Moorman

      Hi Jill,
      I am so excited to see these! I love exceptions that prove the rule. It’s one of the best things about art and science.

      1. Jill Gatwood Avatar

        Hi Joe,
        I sent you some examples!

  5. Caroline Bommer Avatar
    Caroline Bommer

    Love all the amazing advice on this blog 🙂
    I am very new to mosaics and as my first project have done a big sunrise hill and water reflection but am so unsure as to what grout colour or colours to use as have glass tiles ranging from black to gold and green and lots of oranges.
    Would love to attach a photo for suggestions but not sure how.

    1. Joe Moorman Avatar
      Joe Moorman

      Hi Caroline,
      You can them to me. help@mosaicartsupply.com email

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