> On Nov 02, 2010, at 05:22, nigel mccarty-eigenmann wrote: > > > What mineral contents would make a brick come out of the oven blue, > > green > > and black? > > > Usually, bricks are only colored on the surface by applying a glaze > (called "slip") to the green brick before firing. Coloring the brick > paste itself is generally cost-prohibitive, but it can be done. > > Blue - usually cobalt oxide > Green - probably some combination of chrome, cobalt, or uranium > oxides, depending on shade and firing method > Black - perhaps iron oxide in a reducing fire, but it might tend to > change color as it ages
You get different coloured bricks from different minerals in the clay you make the bricks from. I know of yellow, almost white and red from my own window. All Victorian or older. I had heard of green and blue, but I wasn't sure if they were regional or custom. Listmind can always supply an answer :) _______________________________________________ GurpsNet-L mailing list <[email protected]> http://mail.sjgames.com/mailman/listinfo/gurpsnet-l
