What factor can affect the color of grout during curing?

The color of grout during curing can be significantly influenced by temperature and humidity levels. These environmental factors affect the chemical reactions that occur as grout sets and cures. High temperatures can accelerate the curing process, leading to uneven curing and potential color changes, while low temperatures may slow it down, potentially resulting in a darker or uneven color as moisture content can affect the final appearance. Similarly, humidity levels can influence how much water is present in the grout mix and how it evaporates during the curing process, ultimately affecting the final color of the cured grout.

In contrast, while the type of tile may impact the overall aesthetic and installation methods, it does not directly affect the curing color of the grout itself. Exposure to sunlight could indeed impact the curing process as well, but it's the temperature and humidity nuances that are more critical in determining the grout's final appearance. The color of the tile might influence the perception of the grout's color, but does not change the grout's curing characteristics or color outcome.