Can the fly ash brick be made in colors and different shapes?
YES. The natural color of fly ash bricks made of low-carbon fly ash is a neutral buff color — see the arrows in the photo below pointing to such bricks. For fly ash bricks made of high carbon fly ash, the brick is gray or dark grey. Simply adding a small amount of color pigment leads to fly ash bricks of different colors, as shown in the photo below. Figure 1. Assorted fly ash bricks of different colors made at ET. (The three bricks pointed by arrows have natural color of low-carbon fly ash; the dark ones have natural color of high-carbon fly ash; the red ones are made with 1 to 2% of commercially available red colored pigments.
