ᐅ Artificially Altering Granite Color

Hello fellow home builders,

I made a disastrous mistake when purchasing from the developer. When ordering the interior window sills, I specified the granite type "Ivory Fantasy" instead of the planned "Ivory Fantasy Gold." The names sound almost identical, and the textures look very similar, but they differ in color tone. Fantasy Gold leans more toward beige/yellow and has a pleasantly warm appearance, while Fantasy without Gold is more gray, making it look cold and dirty.

I don’t know what can be done now. As you can imagine, since this is a developer project, the window sills were significantly more expensive than the usual market price. Removing everything and reordering would lead to four-figure losses. Since the sills are custom-made by the stonemason, they can’t be returned. And my wife absolutely refuses to accept this.

My question is whether there are any chemicals that can alter the color tone of the granite sills in a certain direction (in this case, beige)? I’m about to be kicked out of the house 😀 and would appreciate any advice.

So, are the window sills already installed? Granite can certainly discolor easily (although this usually happens unintentionally, as it gets dirty more quickly on unpolished surfaces), but would that really look “intentional”? I would ask the stonemason; they might be able to do something (it does make a difference whether the surface is roughly ground or polished) or have a sealant that affects the color appearance. It might be possible to add color pigments to this sealant, but there is a risk it could end up looking worse than before. Definitely consult a professional!

.. the cheapest option would be for your wife to wear glasses with yellow lenses 😉

Stone window sills are very sensitive. Silicic acid would permanently bond the pigment to the stone. If the silicic acid contains a bit of pigment from genuine ochre—with an emphasis on genuine—then everything would silicify together. Genuine ochre comes from earth, while other ochres, loosely speaking, come from rust. The coloring strength largely depends on how finely it is ground. Don’t skimp; you only need less than half a yogurt cup. On a polished surface, the color will not distribute evenly, so a test area is necessary. Silicification takes several weeks, so keep your hands off the forming crystalline connection during that time.

I have tried this once with sandstone. With a gentle touch, the result was flawless.

Good luck!

But honestly: Don’t be afraid of a few gaps. Where work is done, there will be some chips.

You get used to everything; very quickly – sounds silly, but it's true.
Even the cold windowsill starts to shine when you decorate it with matching colors. Put some plants on it, colorful marbles, and a contrasting curtain.