I'll have to look hard for some midrange glazes using borax, I'm not saying there won't be any, but it's definitely less common due to how low of melting point borax has. Borax itself is kind of like a "fireplace glaze material" since it melts at like 1350*F and fireplace can get somewhere around maybe 1400*F.
Two good clear transparent glazes that we use are (NOT tested for functional ware):
- moderate fluidity, there's a lot of flux in this one. Honey color might be 2-4% red iron added.
30 Cornwall Stone
- slightly stiffer. Same percentages iron for honey amber/browns.
25 C-Red Clay
25 Banta Clay
25 OM-4 Ball Clay
10 Manganese Dioxide
10 #6600 Best Black Mason Stain
5 Black Iron Oxide
- great black slip has pretty much full firing range.