brown glaze ?

updated sun 13 oct 02

ranmcc on sat 12 oct 02

I want a brown gloss glaze using the below formula. Temp Cone 4 to 6

Gerstely Borate 50%
Kaolin 20%
Silicia 30%

What percent of colorants will give me a shiny bright brown. Iron?
Manganese? etc?

Fire gas.