06/03/2026
Throwback to the brick dust cleaning experiment I did a few years ago! Often I have seen it said that you have to use old bricks to polish your firelocks. The cutoff year varied from the 1850s to the 1950s and the reason ranged from composition, hardness, firing temperature, and harmful chemicals depending on who you asked. I couldn't find a consistent answer or a really solid explanation so I wanted to test it out.
I used modern paver and red clay brick from the hardware store and compared it to some 19th century brick. The overall results were that the modern bricks were harder to grind into a fine and consistent powder, BUT if you did that it worked just as well as the 19th century brick. Other historical polishing compounds include emory powder, rottenstone, and "whiting powder" (calcium carbonate ie chalk)