Bluing is the last process in sandblasting the lettering and designs. We do this by lowering the psi we sandblast at from 80psi to around 30psi and increasing the flow of the aluminum oxide. By doing this step, we can change the insides of the lettering, the details in the designs and even the surface of the steeled area to a darker color, which helps with the legibility. The polished, steeled and blued areas are all the natural colors of the stone achieved using the different techniques described in the “How We Do It” section.