How to make horsehair raku blue

[Catsnot pottery 0]

Trying to figure out how to make a custom piece of horsehair raku wedgewood or cobalt blue with a soft spray look.  I know how to use ferric chloride on hh raku, but cannot find the chemical or stain to make it blue.  

[neilestrick 4,671]

Use an underglaze wash before bisque firing.

[Catsnot pottery 0]

Would the underglaze be made from mason stain?

[Bill Kielb 1,179]

Google underglaze and pick a color they can be thinned and applied as a wash as well as any level of solid color. Underglazes are colorant, clay, maybe some frit and something added for brush-ability. Colorants can be oxides but are often stains. It’s fairly difficult to make your own using stain, clay, etc......  most folks just use a commercial underglaze.

here is one vendor: https://www.amaco.com/t/glazes-and-underglazes/underglaze/velvet-underglaze/velvet-underglazes

There are many others.

The work below is underglaze and is shown as an example of the ability to wash or water color effect to varying degrees.

Edited February 2 by Bill Kielb

[Min 3,529]

6 hours ago, Catsnot pottery said:

Would the underglaze be made from mason stain?

Extremely likely from ceramic stains, depends which brand the underglaze is made from. Might be Mason might be another stain manufacturer.

[PeterH 135]

This technique using burnished slip might be of interest

A Colorful Variation on the Naked Raku Technique
https://ceramicartsnetwork.org/daily/firing-techniques/raku-firing/a-colorful-variation-on-the-naked-raku-technique/

[Dick White 416]

You can tint terra sigillata with Mason (or other brand) stains. Naked raku and horsehair raku look best when the surface of the body has been burnished and polished to a sheen, which is the purpose of terra sigillata.

[Marcia Selsor 1,915]

mix a terra sig with a mason stain.