Mudtools Blue Workhorse Sponge Ribs & Scrapers In ceramic glazes it is

In ceramic glazes it is used as a source of magnesia and calcia

it is the darkest firing of the medium temperature red bodies

Clay people

but fires to a darker brown color and has the same iron speckling

and it fires to a cream color in oxidation

Mudtools Blue Workhorse Sponge Ribs & Scrapers In ceramic glazes it isThe Blue Sponge is a great all purpose sponge made of an open cell material that is very absorbent. Weve shaped it like a potters rib to fit comfortably in the palm of your hand. Dyed with a natural pigment, the color will fade with use. Natural sponges have been used for years. However, the quality of natural sponges can be unpredictable and there is the issue of environmental pressure on the little guys. Our sponges are made of an environmentally