I have bisqued low fire clay and then used a propane torch to heat the pot to a temperature high enough to do a horse hair firing. If you pull the pot out of a low fire you need to let it cool down to the point where the horse hair will burn and leave a carbon trace. If it is too hot, the carbon will burn away. Too cool, and the hair wont burn to the surface of the pot. There is a learning curve, not only on temperature, but also how you apply the horse hair. ( go to u-tube!!!)
As I said, I did horse hair fires with cold pots heated up with a propane torch. If the effect didn't look right, I just kept heating till the carbon trace burned off, and tried again. Horse hair firing is an art in itself. It ain't rocket science , but it isn't slam dunk either.
If you want to try it out of the kiln, then go for it. If you have a kiln controller, set it to where you see a low red heat. Pull the pot out, and when it loses the glow, start putting your hair on it till you get good traces. To erase mistakes, put it back in the kiln.
- Mark (Marko) Madrazo likes this