I know no one who glazes brick. That would be a waste of money. You can mix the colourants into the slury of clay you use to make brick.
You do glaze tile. You do glaze pottery. This is to typically make them more waterproof and easy to clean. Slip is not glaze. Slip is slip... a combination of the clay use to make the body and colourant. Slip can be applied like a glaze but does not melt when fired and acts like part of the clay. You would never dip a dry or biqued clay peice in slip - only a wet peice. Or the slip would crack and flake off.... and possibly cause a dry clay peice to self destruct. Glaze is a mix of chemicals that goes over the clay - which does not share the same characteristics as the clay at all. It melts onto the clay forming a glass like layer over top of it. You can glaze a dry or bisqued peices - because the glaze is not just another layer of clay. -Sue --- On Tue, 11/2/10, MIB 0123 <[email protected]> wrote: > From: MIB 0123 <[email protected]> > Subject: Re: [gurps] A question about Bricks > To: "The GURPSnet mailing list" <[email protected]> > Received: Tuesday, November 2, 2010, 7:22 AM > 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 > > > > _______________________________________________ > GurpsNet-L mailing list <[email protected]> > http://mail.sjgames.com/mailman/listinfo/gurpsnet-l > _______________________________________________ GurpsNet-L mailing list <[email protected]> http://mail.sjgames.com/mailman/listinfo/gurpsnet-l
